I've been using it for about a month!! There is no power supply. I'm selling it due to moving!! Operation has been confirmed! Shipping will include the amplifier, instruction manual, waterproof cap, and unopened connector only. Shipping will be done by taking it out of the box, wrapping it in bubble wrap, and putting it in a Yu-Packet Plus cardboard box. This is the lowest price, so it's first-come, first-served and available for immediate purchase.