This ultrasonic cleaner device is meant to clean and sterilize a mouth piece (like a retainer, mouth guard, or teeth align trays, etc.) using vibrations and light, but can clean other items as well (see picture). I accidentally bought an extra and missed the return window. It’s never been opened. Powered by cord & plug (provided). (Fun fact: I never ended up purchasing the Byte retainers, but I’m keeping one of these and will try to clean my jewelry in it instead!) Make sure to read the full instructions (provided) before using.