Check the listing for details. Mission Engineering Inc 529i USB Pedalboard Power Supply With Integrated Battery. Condition: New. Listed at 199.00 USD. Portable Pedal Power Supply Hate plugging your pedalboard in with extension cables? The Mission Engineering 529i USB Pedal Power Supply gives you the convenience of running your pedalboard with no extra cords. This compact device can power up to eight standard pedals using its large, onboard Li-Ion battery. The 529i can be powered from nearly any USB device or the included wall charger. That means you can charge up on the way to your show, or plug your power supply in before bed. Have 18-volt pedals? No problem. The 529i includes a voltage doubler cable that uses two 9-volt outputs to power a single 18-volt pedal. To get the most out of your pedalboard, choose the Mission Engineering 529i Pedal Power Supply.