Features: High quality alloy steel, easy to remove dental calculus, smoke stains and tea stains. Electric Sonic high frequency vibration enables to erase leftovers or food debris on the teeth effectively. Five adjustable vibrating speed levels meet your different cleaning needs. Rechargeable battery design, USB for easy charging, convenient to carry anywhere. IPX6 waterproof grade, more convenient for teeth cleaning use. Note: Pls kindly note that due to different monitors, the item color showed in the picture may be slightly different form the true color. Specifications: Type: Tooth Stain Eraser Color: Blue; Pink (Optional) Battery: Rechargeable lithium battery Waterproof grade: IPX6 Rated current: 200mA Standing current: ≤20ua Item Size: 19.3 * 3 * 2cm / 7.6 * 1.2 * 0.8in Item Weight: 53.6g / 1.9oz Package Size: 22.5 * 8.0 * 3.5cm / 8.9 * 3.1 * 1.4in Package Weight: 186.2g / 6.6in Package List: 1 * Main Machine 1 * USB Cable 1 * User Manual