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Amazon.com: Sqrgreat USB DC 5V to DC 9V Voltage Power Supply Cable - USB to 9V Cable with DC Jack 5.5 x 2.1mm, Tip Negative(-) Design, Max DC-5V-to-9V 0 : Electronics
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Amazon.com: Sqrgreat USB DC 5V to DC 9V Voltage Power Supply Cable - USB to 9V Cable with DC Jack 5.5 x 2.1mm, Tip Negative(-) Design, Max DC-5V-to-9V 0 : Electronics
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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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