Amazon.co.jp: Ulyris USB to DC, Outer Diameter 0.2 inch (5.5 mm), Inner Diameter 0.1 inch (2.5 mm), Power Supply Cable, DC 0.2 x 0.1 inch (5.5 x 2.5 mm), USB to 5V
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Usb To Dc Power Cable Jack Usb Dc 2.0*0.6mm 2.5*0.7mm 3.5*1.35mm 4.0*1.7mm 5.5*2.1mm 5v Dc Barrel Jack Usb Power Cable Connector - Pc Hardware Cables & Adapters - AliExpress