Specification Battery Capacity: 250mAh Working Voltage: 3.7-4.2V Rated Current: 130mA Max Charging Method: USB Charging Cable Feature: 1. Effective Dental Calculus Remover The dental calculus remover has up to 30000 vibrations per minute and is made with premium stainless steel that will work thoroughly to remove plaque, tartar, and food debris on your mouth. 2. Safe & Premium Materials With stainless steel and food-grade silicone material, You can have a more comfortable feeling and easier cleaning 3. USB Charging & Portable The dental calculus remover comes with a USB charging cable, convenient to recharge anytime. Please choose the adapter of 5V-1A to charge, and the battery capacity is 250mAh. IPX6 grade waterproof can be washed directly with water, safe and convenient. Extra-Features 1. This dental cleaning tool comes with an LED HD screen, auxiliary LED light and a silicone handle. 2. It has a smart memory function, which automatically selects the last shutdown mode when it is opened. 3. It also has 3 heads to choose from depending on your dental needs. Package including as show in the picture.