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In-line power switch for 2.1mm barrel jack : ID 1125 : $2.50 : Adafruit Industries, Unique & fun DIY electronics and kits
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Amazon.com: CHANZON 10 Pcs 12V DC Power Jack Male Connector 5.5 mm x 2.1 mm Barrel Plug for CCTV Security Camera Cable Wire Adapter : Industrial & Scientific
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