• A single power supply for one, two, or three KORG Volca units - Beats, Bass and Keys • TVV is a high-quality DC power supply rated at 9V / 800mA, with three center-positive 1.7mm outputs• It is a regulated supply which means no matter how many devices are connected, each one will always get a nice safe 9 volts.• Each KORG Volca model was tested, and they only consume between 60mA (idle) and around 80mA (playing at full volume)• All three Volcas together won't draw more than 250mA, meaning this 800mA supply is safe for your devices.• Cheaper and more convenient than buying THREE KORG KA-350's!