myVolts Ripcord USB to 9V DC power cable is compatible with the Korg Volca Modular and lets you power the device from a USB port. Works with any USB port - laptop, phone charger, desktop PC, or even a mobile USB battery! It takes the 5V from a USB port and turns it into the 9V and amperage the Korg Volca Modular Synth needs. .
eBay