Amazon.com: 5pack 9v Battery Clip with 2.1mm X 5.5mm Male DC Plug for Arduino by Corpco : Electronics
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Amazon.com: HQRP 9V AC/DC Power Adapter Works with Arduino Uno Due Leonardo Mega Power Supply PSU [UL Listed] + Euro Plug Adapter : Electronics
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Amazon.com: 9V 2A Power Supply Adapter AC DC Cable Cord for Arduino UNO MEGA, 5.5mm x 2.1mm & 2.5mm Plug, and More (6ft) : Electronics
9V 1A DC Power supply adapter for Arduino
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Amazon.com: 9V 1A AC DC Power Supply Adapter, AC 100-240V to DC 9 Volt 1 Amp, DC Plug 5.5x2.1mm & 2.5mm Center Positive for Arduino UNO R3 Mega 2560 1280, Arduino CCTV : Electronics
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9 Volt Battery Adapter for Arduino : 4 Steps - Instructables