This electric scaler features true ultrasonic high frequency vibration technology that vibrates up to 2 million times per minute. Easily removes calculus, tobacco stains and plaque. No noise, no vibration (handheld no vibration). This plaque remover gives you more confidence in your smile.3 different intensity adjustment modes to meet your various needs. Comfort mode for sensitive teeth, Clean mode for removing stains caused by coffee, tea and cigarettes, Power mode for stubborn deep stains and plaque. Two dental cleaning kits are available, model A comes with 1 extra removable cleaning head, 1 spanner for removing the cleaning head, model B comes with 1 extra removable cleaning head, 1 spanner for removing the cleaning head, 3 tools and a dental mirror to aid observation. Our calculus remover only activates when it comes into contact with teeth and hard objects. It stops vibrating as soon as it comes into contact with gums and other soft tissues.100% safe, even if it's your first time using it, it's suitable for both adults and children. Enjoy professional teeth cleaning at home anytime! Make you love cleaning your teeth. Built-in 1200mAh Li-Ion battery with USB charging cable, easy to charge with any 5V-1A adapter.4 hours fast charging, up to 52 uses (5 mins/use), if used for too long (more than 10 mins), the scaler will automatically shut down to prevent the device from overheating.IPX7 rated waterproof and washable all over body, it's easy and fast to use.The scaler will automatically shut down if used for too long (more than 10 mins), preventing the device from overheating.