RFID Readers and RFID tags are a super fun technology to use in your DIY and education projects. With the explosion in Arduino popularity adding an Arduino RFID Shield to your projects can easily add wireless tagging of objects and IDs. RFID stands for Radio Frequency Identification. Each RFID tag has a unique ID which can be read wirelessly from your RFID Reader. Using an RFID reader and tags acting as electronic keys you can create programs to unlock doors or custom project boxes, trigger sounds, photos, or audio files to create games and learning tools, or build custom logging programs for things like races or timecards. Review the different RFID readers and tags offered below to find the right fit for your wireless RFID project.


RFID EM4200 Blue Ring RFID Key Fob RFID EM4200 Blue Ring RFID Key Fob, 125hz tags, RFID tags, RFID fob, RFID ring, Thin RFID card
Price: $0.99
Availability: In Stock
Item #: RFID-RNGFOB -

    The RFID EM4200 Blue Ring RFID Key Fob is a lightweight key chain or luggage accessory for read only RFID. It measures roughly 35mmand is made from a hard plastic. RFID EM4200 Blue Ring RFID Key Fob Frequency 125 kHz Protocol EM4200 Read / Write Read only EEPROM Capacity 64 Bits Diameter 35mm Read Range 63.5mm ...

    RFID EM4200 Blue Silicone Adjustable Wrist Band, Watch Style RFID EM4200 Blue Silicone Adjustable Wrist Band, Watch Style, 125hz tags, RFID tags, RFID fob, RFID ring
    Price: $2.15
    Availability: In Stock
    Item #: RFID-ADJWRI -

      The RFID EM4200 Blue Silicone Adjustable Wrist Band is a one size fits most adjustable RFID wristband. Silicone is lightweight and comfortable to wear, max diameter of roughly 8CM and minimum diameter of roughly 5cm. RFID EM4200 Blue Silicone Adjustable Wrist Band Frequency 125 kHz Protocol EM4200 Read / Write Read only EEPROM Capacity 64 Bits Diameter Approx. 40mm - 90mm Read Range 63.5mm ...

      RFID EM4200 Happy Face Luggage Tag  RFID EM4200 Happy Face RFID Luggage Tag , 125hz tags, RFID tags, RFID fob, RFID ring, Thin RFID card
      Price: $1.30
      Availability: In Stock
      Item #: RFID-HPPYFOB -

        The RFID EM4200 Happy Face Luggage Tag is a lightweight key chain or luggage accessory for read only RFID. It measures roughly 30mm in diameter and is covered in a protective plastic. RFID EM4200 Happy Face Luggage Tag Frequency 125 kHz Protocol EM4200 Read / Write Read only EEPROM Capacity 64 Bits Diameter 30mm Read Range 63.5mm ...

        RFID EM4200 Monkey RFID Key Fob RFID EM4200 Monkey RFID Key Fob, 125hz tags, RFID tags, RFID fob, RFID ring, Thin RFID card
        Price: $1.47
        Availability: Back Order
        Item #: RFID-MNKFOB -

          The RFID EM4200 Monkey RFID Key Fob is a lightweight key chain or luggage accessory for read only RFID. It measures roughly 35mm x 40mm x 5mm and is made from a soft silicone rubber. RFID EM4200 Monkey RFID Key Fob Frequency 125 kHz Protocol EM4200 Read / Write Read only EEPROM Capacity 64 Bits Dimensions approx. 35mm x 40mm x 5mm Read Range 63.5mm ...

          RFID EM4200 Silicone Stretch Spring Wristband  RFID EM4200 Silicone Stretch Spring Wristband , 125hz tags, RFID tags, RFID fob
          Price: $1.89
          Availability: In Stock
          Item #: RFID-SPRWRI -

            The RFID EM4200 Silicone Stretch Spring Wristband is a comfortable one size fits most RFID wristband with a watch like face. With a Starting diameter of roughly 65mm this wristband will stretch to accommodate most. RFID EM4200 Silicone Stretch Spring Wristband Frequency 125 kHz Protocol EM4200 Read / Write Read only EEPROM Capacity 64 Bits Diameter 65mm Read Range 63.5mm ...

            RFID EM4200 White Luggage Tag RFID EM4200 White Tag with Wire Wrap, 125hz tags, RFID tags, RFID fob
            Price: $1.30
            Availability: In Stock
            Item #: RFID-WHTTAG -

              The RFID EM4200 White Luggage Tag is a sturdy little RFID tag made in the classic price/luggage tag style. This is great for easily labeling and identifying all kinds of things! RFID EM4200 White Luggage Tag Frequency 125 kHz Protocol EM4200 Read / Write Read only EEPROM Capacity 64 Bits Dimensions 45mm x 25mm Read Range 63.5mm ...

              RFID EM4200 Wooden RFID Thin Card RFID EM4200 Wooden RFID Thin Card, 125hz tags, RFID tags, RFID fob, RFID ring, Thin RFID card
              Price: $3.49
              Availability: Back Order
              Item #: RFID-WOODCARD -

                The RFID EM4200 Wooden RFID Thin Card measures 86mm x 54mm x 1.5mm, just about the size of a normal credit card. The wooden RFID card will fit in a credit card slot in most any wallet, the wood finish allows for customization with laser engraving and printing. (We do not offer laser engraving or printing services) RFID EM4200 Wooden RFID Thin Card Frequency 125 kHz Protocol EM4200 Read / Write Read only EEPROM Capacity 64 Bits Dimensions 86mm x 54mm x 1.5mm Read Range 63.5mm ...

                RobotGeek Arduino RFID Windows Login Kit RobotGeek, RFID, Windows, Login, Kit, 8, windows 8, windows 7, windows 10, rfiduino, robot, geek, kb, vista
                Price: $49.95
                Availability: In Stock
                RobotGeek Item #: RG-RFIDLOGIN -

                  The RobotGeek RFID Windows Login Kit gives you the power to log into your Windows (Vista, 7, 8, or 10) Personal Computer using a quick and easy RFID tag swipe! Our detailed tutorial will guide you through the process to install the login files on your PC as well as get the Windows Login Firmware on your Geekduino. When swiped, your RFIDuino and Geekduino will pass the tag information onto your PC. Any tags that match your setup files will activate the login software and log you into your...

                  RFIDuino Shield V1.2 Arduino RFID Shield, RFID Arduino, Arduino RFID, RFID Shield for Arduino, Arduino EM4102, Arduino RFID reader, V1.2
                  Price: $17.50-$34.95
                  Availability: In Stock
                  RobotGeek Item #: RG-RFIDUINO -

                    This page is for the RFIDuino V1.2. Visit this guide to see the differences between the Version 1.1 and 1.2 Hardware. The RFIDuino is an Arduino RFID Shield which makes Arduino RFID projects super easy to build. Just drop the RFIDuino Shield onto your Arduino microcontroller, load our sample code, and you'll be reading tags in no time! Our getting started guide will take you through the process of working with the RFIDuino from loading basic code to more advanced projects like triggering...

                    RFIDuino Wireless Upgrade Kit Wireless RFID, Xbee RFID,
                    Price: $76.95
                    Availability: In Stock
                    RobotGeek Item #: KIT-RFIDUINO-W-KT -

                      The RFIDunio Wireless Communication Starter Kit provides everything you need to harness the powerful and versatile technology of Zigbee wireless communication and free your RedBee from wires. Perfect for remote installations, mobile platforms, or any application where 'cutting' the USB cable to your PC is convenient.   [2x] XBee 1mW Communication Module This is the very popular 2.4GHz XBee module from Digi. These modules take the 802.15.4 stack (the basis for Zigbee) and wrap it into a...

                      Parallax RFID Card Reader (USB)
                      Price: $44.99
                      Availability: In Stock
                      Parallax Item #: PX-28340 -

                        Designed in cooperation with Grand Idea Studio, the Parallax RFID Reader Module USB is a low-cost solution to read passive RFID transponder tags. The RFID Reader Module USB can be used in a wide variety of hobbyist and commercial applications, including access control, automatic identification, navigation, inventory tracking and payment systems. This module connects directly to a USB port for both power and to output transponder tag data to your custom PC application. Features: * Built-in USB...

                        Parallax RFID Card Reader (Serial)
                        Price: $39.99
                        Availability: In Stock
                        Parallax Item #: PX-28140 -

                          Designed in cooperation with Grand Idea Studio, the Parallax Radio Frequency Identification (RFID) Reader Module is the first low-cost solution to read passive RFID transponder tags. The RFID Reader Module can be used in a wide variety of hobbyist and commercial applications, including access control, automatic identification, robotics, navigation, inventory tracking, payment systems, and car immobilization.This reader is compatible with EM4102 RFID tags (125 kHz).  The read range varies...

                          EM4102 Tag Kit
                          Price: $11.95
                          Availability: In Stock
                          Trossen Robotics Item #: RFID-KT-TGKT4 -

                            Kit Includes: 1 x Credit Card Thin Card (ISO) 1 x Thick Card (Clamshell) 1 x Inventory Label - Square Version (38 x 38 mm) 1 x 18mm Button with Sticker Backing 1 x 35mm White Disk with Hole 1 x 30mm Global Tag (black) 1 x 25mm White Disk 1 x 25mm White Disk (sticker backing) 1 x 30mm Clear Thin Lamination Disk 1 x 30mm Clear Thin Lamination Disk (sticker backing) 1 x 25mm Clear Thin Lamination Disc 1 x Blue Key Fob 1 x Wristband Watch Style *Tags might change depending on availability, but...

                            Phidgets 1024 reader top view
                            Price: $60.00
                            Availability: In Stock
                            Phidgets Inc Item #: PH-1024 -

                              The Phidgets RFID Reader is a great tool to add RFID functionality to your computer application. Using Phidget's extensive collection of libraries and APIs you can easily control the RFID reader via a variety of programming languages. The Phidget RFID reads tags that are brought in close proximity (within 4 inches, depending on the tag). The reader reads EM4102 type tags and operates at 125 kHz. In addition to reading cards, this unit also has two 5v outputs labeled "+5V" and "LED". These work...

                              RFID EM4200 25mm Clear Plastic Disk
                              Price: $0.79
                              Availability: In Stock
                              Item #: RFID-25DISK -

                                RFID EM4200 25mm Clear Plastic Disk Frequency 125 kHz Protocol EM4102 Read / Write Read only EEPROM Capacity 64 Bits Dimensions 25mm diameter / approx 1mm thickness Read Range 76.2mm ...

                                pcProx USB RFID Reader
                                Price: $179.00
                                Availability: In Stock
                                RF IDeas Item #: RFID-RDR-6E81AKU -

                                  pcProx®-USB: No Programming Required! The pcProx USB RFID reader is compatible with all EM4102 (125 kHz)RFID tags.  This reader acts as a hassle-free keyboard wedge.  The powerful yet intuitive configuration software can be used to configure the reader’s output with various formatting options. Once configured, pcProx takes the proximity card’s identification information and sends it as keystrokes as if it were typed by the user. When pcProx is deployed, no software is needed. ...

                                  pcProx 125 kHz USB Dongle Reader RFID thumb dongle, RFID dongle, USB RFID stick, USB RFID reader, rfid reader USB stick, small RFID reader, pcprox, pc prox
                                  Price: $159.95
                                  Availability: Back Order
                                  RF IDeas Item #: RF-6ED1AKU -

                                    The pcProx USB RFID Reader has little brother, the pcProx USB Dongle Reader! This diminutive reader is compatible with all EM4102 (125 kHz)RFID tags. Out of the box, this reader will read RFID tags and translate them into keystrokes, just as if they had been typed by a computer. The powerful yet intuitive configuration software can be used to configure the reader’s output with various formatting options.In most common uses, the reader emulates a keyboard and keystrokes the card’s ID and/or...

                                    RFID EM4200 25mm Clear Plastic Disk (Sticker Backing)
                                    Price: $0.79
                                    Availability: In Stock
                                    Item #: RFID-25DISKS -

                                      RFID EM4200 25mm Clear Plastic Disk (Sticker Backing) Frequency 125 kHz Protocol EM4102 Read / Write Read only EEPROM Capacity 64 Bits Dimensions 25mm diameter / approx 1mm thickness Read Range 76.2mm ...

                                      DVD / CD-Rom RFID Tag cd rom rfid tag, dvd rfid tag, cd rfid tag, dvd rfid, cd rfid, dvd tag, cd tag
                                      Price: $0.69
                                      Availability: In Stock
                                      Item #: RFID-TAG-125-LBLCD -

                                        Product Name    CD-Rom Tag Frequency    125 kHz Protocol    EM4102 Read/Write    Read only EEPROM Capacity    64 bits Dimensions    34mm diameter Notes      ...

                                        RFID EM4200 25mm Clear Plastic Disk (Doubled Sided Sticker Backing)
                                        Price: $0.79
                                        Availability: In Stock
                                        Item #: RFID-25DISK2S -

                                          RFID EM4200 25mm Clear Plastic Disk (Double Sided Sticker) Frequency 125 kHz Protocol EM4102 Read / Write Read only EEPROM Capacity 64 Bits Dimensions 25mm diameter / approx 1mm thickness Read Range 76.2mm ...

                                          RobotGeek Arduino RFID Experimenters Kit RobotGeek, robot, geek, Geekduino, arduino, starter, Experimenters, Kit, rfid, tag, shield
                                          Price: $79.95
                                          Availability: In Stock
                                          RobotGeek Item #: KIT-RGRFIDEX -

                                            The RobotGeek RFID Experimenter's Kit is a strong introduction to the use of RFID tags in the Arduino environment. Utilizing the power of the Geekduino in conjunction with the RFIDuino Shield, this kit gives you access to the world of Radio Frequency Identification in a smart, easy way! Learn about triggering events with the swipe of an RFID tag in fun and exciting ways, even integrating household systems with use of the relay and LCD Display! As part of the RobotGeek Experimenter's line, the...

                                            25mm RFID Sticker
                                            Price: $0.79
                                            Availability: In Stock
                                            Item #: RFID-25STICKER -

                                              RFID EM4200 25mm White Round Sticker Frequency 125 kHz Protocol EM4102 Read / Write Read only EEPROM Capacity 64 Bits Dimensions 25mm diameter / approx 0.5mm thickness Read Range 76.2mm ...

                                              RFID EM4200 40mm Clear Plastic Disk (Sticker Backing)
                                              Price: $0.79
                                              Availability: Back Order
                                              Item #: RFID-40DISK -

                                                RFID EM4200 40mm Clear Plastic Disk (Sticker Backing) Frequency 125 kHz Protocol EM4102 Read / Write Read only EEPROM Capacity 64 Bits Dimensions 40mm diameter / approx 1mm thickness Read Range 114.3mm ...

                                                RFID EM4200 40mm White Round Sticker
                                                Price: $0.79
                                                Availability: In Stock
                                                Item #: RFID-40STICKER -

                                                  RFID EM4200 40mm White Round Sticker Frequency 125 kHz Protocol EM4102 Read / Write Read only EEPROM Capacity 64 Bits Dimensions 40mm diameter / approx 0.5mm thickness Read Range 101.6mm ...

                                                  RobotGeek Arduino RFID Lock Box Kit RobotGeek, RFID, Lockbox, Kit, Robot, Geek, Lock, solenoid, RFIDuino, Geekduino, Trossen, Robotics, Project, Box
                                                  Price: $44.95
                                                  Availability: In Stock
                                                  RobotGeek Item #: RG-RFIDLOCK -

                                                    The RobotGeek RFID Lock Box kit combines Arduino, RFID and a Project Box to make your very own personal safe! The lock box kit allows you to to program your arduino to lock and unlock the box with the swipe an RFID tag or card, it even stays locked if unplugged. Mildly secure your semi-valuables in this decorative conversation piece!   We don't advise keeping real valuables in the treasure box! Kit Includes: 1x Wooden Project Box 1x RobotGeek Geekduino 1x RobotGeek RFIDuino 1x...

                                                    RFID Key Fob
                                                    Price: $0.79
                                                    Availability: In Stock
                                                    Item #: RFID-TAG-125-KCBLUE -

                                                      Blue RFID Key Fob Frequency 125 kHz Protocol EM4102 Read / Write Read only EEPROM Capacity 64 Bits Dimensions 1.5" x 1.25" Read Range 76.2mm ...

                                                      RFID EM4200 Thin Cards
                                                      Price: $0.79
                                                      Availability: In Stock
                                                      Item #: RFID-TAG-125-CRD1 -

                                                        These RFID cards are printable, and compatible with most major card printers like Zebra, Fargo, and Pebble printers. RFID EM4200 Thin Cards Frequency 125 kHz Protocol EM4102 Read / Write Read only EEPROM Capacity 64 Bits Dimensions 86 x 54 x 0.82 mm Read Range 76.2mm ...

                                                        RFID EM4200 Silicone RFID Wristband (Black)
                                                        Price: $1.95
                                                        Availability: In Stock
                                                        Item #: RFID-BAND-BLK -

                                                          RFID EM4200 Silicone RFID Wristband (Black) Frequency 125 kHz Protocol EM4102 Read / Write Read only EEPROM Capacity 64 Bits Dimensions 60mm Diameter Read Range 63.5mm ...

                                                          RFID EM4200 Silicone RFID Wristband (Blue)
                                                          Price: $1.95
                                                          Availability: Back Order
                                                          Item #: RFID-BAND-BLU -

                                                            RFID EM4200 Silicone RFID Wristband (Blue) Frequency 125 kHz Protocol EM4102 Read / Write Read only EEPROM Capacity 64 Bits Dimensions 60mm Diameter Read Range 63.5mm ...

                                                            RFID EM4200 Disposable Wristband (White)
                                                            Price: $0.95
                                                            Availability: In Stock
                                                            Item #: RFID-DSWRB -

                                                              RFID EM4200 Disposable Wristband (White) Frequency 125 kHz Protocol EM4102 Read / Write Read only EEPROM Capacity 64 Bits Dimensions 25cm length (one size fits most) Read Range 50.8mm ...

                                                              RFID EM4200 Disposable Wristband (Red)
                                                              Price: $0.95
                                                              Availability: In Stock
                                                              Item #: RFID-DSWRB-RED -

                                                                RFID EM4200 Disposable Wristband (Red) Frequency 125 kHz Protocol EM4102 Read / Write Read only EEPROM Capacity 64 Bits Dimensions 25cm length (one size fits most) Read Range 50.8mm ...

                                                                RFID Ampoule Tag
                                                                Price: $2.95
                                                                Availability: In Stock
                                                                Item #: RFID-MD-AMP -

                                                                  DISCLAIMER: Trossen Robotics does not advise or encourage users to implant the RFID tags we sell into humans or animals. These tags are not sold as medical products and are NOT sanitized for medical use. Trossen Robotics is NOT responsible for use of the tags in any form of implanting and we strongly advise against any such use of the tags we sell. We make no guarantee, claim, or authorization of use of our tags as human or animal implant products. Small Glass RFID Ampoule Tag Frequency 125...

                                                                  RFID Ampoule Tag
                                                                  Price: $2.95
                                                                  Availability: In Stock
                                                                  Item #: RFID-SM-AMP -

                                                                    DISCLAIMER: Trossen Robotics does not advise or encourage users to implant the RFID tags we sell into humans or animals. These tags are not sold as medical products and are NOT sanitized for medical use. Trossen Robotics is NOT responsible for use of the tags in any form of implanting and we strongly advise against any such use of the tags we sell. We make no guarantee, claim, or authorization of use of our tags as human or animal implant products. Extra Small Glass RFID Ampoule Tag Frequency...

                                                                    RFID 25mm White Disk
                                                                    Price: $0.89
                                                                    Availability: In Stock
                                                                    Item #: RFID-TAG-125-DSK25 -

                                                                      Product Name    25mm White Disk Frequency    125 kHz Protocol    EM4102 Read/Write    Read only EEPROM Capacity    64 bits Dimensions    25mm diameter Notes      ...

                                                                      RFID 25mm White Disk  (Sticker backing)
                                                                      Price: $0.89
                                                                      Availability: In Stock
                                                                      Item #: RFID-TAG-125-DSK25S -

                                                                        Product Name    25mm White Disk (Sticker backing) Frequency    125 kHz Protocol    EM4102 Read/Write    Read only EEPROM Capacity    64 bits Dimensions    25mm diameter Notes      ...

                                                                        RFID Wristband Watch Style
                                                                        Price: $1.80
                                                                        Availability: In Stock
                                                                        Item #: RFID-TAG-125-WATCH -

                                                                          Product Name    Wristband Watch Style Frequency    125 kHz Protocol    EM4102 Read/Write    Read only EEPROM Capacity    64 bits Dimentions    1 3/8" diameter Notes      ...

                                                                          Large Glass RFID Ampoule Tag
                                                                          Price: $6.50
                                                                          Availability: In Stock
                                                                          Item #: RFID-TAG-125-GALG -

                                                                            Product Name    Large Glass Ampoule Tag Frequency    125 kHz Protocol    EM4102 Read/Write    Read only EEPROM Capacity    64 bits Dimensions    34mm x 4mm Notes    DISCLAIMER: Trossen Robotics does not advise or encourage users to implant the RFID tags we sell into humans or animals. These tags are not sold as medical products and are NOT sanitized for medical use. Trossen Robotics is NOT responsible for use of the tags in...