USB DC 5V to DC 9 Volt USB Power Supply Cable, Max Current 800mAh, Tip Negative Connector, Compatible for Guitar Effects Pedals Power Supply Adapter

Plug & Play, it is really handy when travelling or outdoors, just power it with a 5V 2A-4A power bank and you can start running your 9V Guitar Effects

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USB DC 5V to DC 9V Voltage Power Supply Cable, Max Current 800mAh