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USB to 2.1mm DC Booster Cable - 9V : ID 2777 : $6.50 : Adafruit Industries, Unique & fun DIY electronics and kits
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USB-9V - (USB to 9 volt step up power supply cable) (Works with Center negative polarity pedals) | Reverb
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Universal 9V Battery Eliminator USB Power Supply Cable for Multimeter Microphone Guitar 2m Replace Your 9-Volt Batteries - AliExpress
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