Specifications: Rated voltage: 3.7V Rated current: 200mA Battery capacity: 250mAh Product size: 183 * 30 * 22mm Charging voltage: 5V Motor noise: ≤60dB Package Contents: 1 *Rechargeable tartar remover 1 *Charging cable 1 *User Manual how to use? 1. Press the power button to turn on the device. Press the up and down buttons to select the appropriate gear. 2. Look in the mirror and place the metal head on the treatment site. Press lightly to remove any plaque or tartar. 3. The device pauses for 1 second every 30 seconds, and automatically shuts down after 3 minutes. Rinse your mouth with water and clean the equipment. Repeat the previous steps as needed. Why do I need dental calculus remover? 1. Up to 11,000 vibrations per minute, with excellent teeth cleaning effect 2. Effectively remove dental plaque/tartar/tartar/tobacco stains/coffee stains, etc. 3. Maintain oral health and breathe fresh every day 4. Made of medical alloy steel and food-grade organic silicon, safe to use 5. Compared with washing teeth in a dental clinic, it reduces money and time expenditure 6. IPX6 waterproof makes washing easy