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This 4x AA Battery to 2.1/5.5mm DC Barrel Jack is perfect for small mobile Arduino Projects. Just add 4 AA batteries and plug the barrel jack into your Arduino Board, and you're ready to rock! Supplies just over 6 volts of power with a fresh set of batteries, which works well with a wide variety of projects. Great for infrared, LED, or any small Arduino project you'd like to take on the go!