This ultrasonic jewelry cleaner restores the sparkle to your jewelry and it can be programmed at the touch of a button, allowing you to select from 5 cleaning cycles that range from 1 1/2 to 8 minute intervals for light cleaning to extended washing. The tank is made from stainless steel (for proper sound wave impedance) and the 42,000 Hz of ultrasonic sound waves remove dirt and dust particles from rings, bracelets, and necklaces without manual scrubbing or using harsh chemicals. When the 20 1/4-oz. tank is filled with water and the unit is turned on, ultrasonic energy creates millions of microscopic bubbles that cavitate thousands of times per second to remove foreign particles and to clean your jewelry. An LCD shows time remaining in the cycle, a window in the lid allows visual inspection of the cleaning process, and whisper-quiet, solid state circuitry prevents noise. Also suitable for precious metals and gems, metal cutlery, waterproof watches, and eyeglasses. Includes watch stand and plastic basket. Plugs into AC. 5 1/2" L x 8" W x 5" H. (13/4 lbs.)