C&E Digital Ultrasonic Cleaner CD-3800A for Jewelry, Eyeglass, and Dentures Cleaner Digital Ultrasonic Cleaner CD-3800A for Jewelry, Eyeglass, and Dentures Cleaner Ultrasonic Frequency: 42,000 Hz Stainless steel tank Color: White and gray Five working cycles with automatic shutoff: 90s, 180s, 280s, 380s, 480s