In the kit there was a USB wire and an adapter for the outlet. That pts conveniently wires are stored in the pocket of the knee pad. only 3 working modes, they all switch with one button, this same button knee on and off. It warms evenly, the heat is pleasant, it relieves pain well. The knee is fastened with Velcro, so it will suit different volumes of legs, if desired, you can use it on your hands. The knee of neoprene is made, soft, comfortable to the body, does not require special care. In general, I advise you to pay attention to this product.