Ultrasonic cleaning is a process that uses ultrasound to agitate a fluid. Used to clean many different types of objects, including jewelry, eyeglasses, watches, tools, coins. Removes dirt and bacteria. Ultrasonic power: 120 W (2pcs transducers) Frequency: 40KHz Heating power: 200W Tank capacity: 2.5L Timer: 7 Digital Timer Settings Voltage: AC 100~120V, 60Hz; AC 220~240V, 50Hz Tank size: 250 x 150 x 80 mm Unit size: 290 x 223 x 185 mm Packing size: 340 x 250 x 235 mm Net weight: 2.8 kg Gross weight: 3.3 kg Certificate: ISO9001:2008; CE; RoHS; FCC