SONIC cleaner Ultrasonic Vibration Cleaner Effectively cleans dirt that has entered the details of dentures, jewelry, etc. with micro-vibrations of 5800 oscillations per minute (for about 5 minutes) with 5,800 vibrations. Insert two AA batteries and use. Please note that there are some stains on the outer box due to home storage. Thank you for your understanding. Size: Length (at the center) 8 cm, Width 9.5 cm Height: 7.5 cm Thank you for viewing.