This ultrasonic Jewelry and Eye Glass Cleaner is a quick, economic, chemical-free way to clean anything from jewelry to electric shaver heads. The cleaner uses ordinary tap water instead of harsh chemicals. The 16-ounce stainless steel tank cleans jewelry, dentures, eyeglasses, watches, electric shaver heads and even printer heads by generating 42,000 energy waves per second in a quick, quiet, fully automatic 3-minute cycle. Can be used professionally by jewelers, dentists, artists, and more. 3-minute auto shut-off 90-day warranty