Ultrasonic Cleaner 450mL (18W)An effective way to clean your jewelry, watch bands, fountain pens, dentures, razor heads, printer heads, coins, eyeglasses, small silverware, and small machined parts. It also has UV lights for disinfectant. Powered via a USB adaptor (not included) or charge the internal battery for cable free use. Fill the 450ml bowl with water, add a mild cleaning solution, then press the power button to start the 3 minute timer. Intended for domestic use only.