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20/10/5Pcs T Type 9V DC Battery Snap Power Connector Cable Plug Clip Barrel Jack Connector Adapter for Arduino Uno R3 DIY T type - AliExpress
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Amazon.com: 9V 1A AC DC 100V-240V Power Supply Adapter Cord for Arduino UNO MEGA, US Plug 5.5mm x 2.1mm & 2.5mm : Electronics
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