HomCom Ultrasonic Jewelry and Eyeglass Cleaner with Digital Timer - White/Gray Highly-effective cleaning system works to remove impurities from valuable items without damaging them Produces 42,000 Hz of ultrasonic sound waves for a safe yet powerful cleaning power LCD display with 5 preset cleaning cycles (90, 180, 270, 360 and 450 seconds) and auto shut-off Large capacity 20oz (600 ml) stainless steel tank plus plastic basket and watch holder Keeps jewelry looking brand new