MarginMart CD-3800A Digital Ultrasonic for Jewelry, Eyeglass, and Dentures Cleaner Cleans jewelry, eyeglasses, coins, metal watchbands, dentures, electric shaver heads, keys and more! Digital display counts down the cycle Five working cycles with automatic shutoff: 90s, 180s, 280s, 380s, 480s For use at home or business Stainless steel tank !! Ultrasonic Frequency: 42,000 Hz !! Lead-free components (RoHS compliant)