Type: Electric Oral Irrigator Item Type: Oral Irrigator Power Source: Rechargeable Battery Ultrasonic Dental Calculus for Teeth Tartar Tartar Stain Dental Calculus Remover Electric Sonic Teeth Plaque Cleaner Dental Stone Removal. The device works when it touches hard thing such as teeth, if you use it on the skin, it will not work. Product name: Portable and Storage Flosser with Four Heads Product Model: 104228 Material: ABS Product color: white Rated voltage: DC3.7V Rated Power: 3.5 W Water tank volume: 230ML Battery capacity: 1200 mAh Charging time: 2-3H Battery life: 20-30 days Pulse frequency: 1800 times/min Water pressure: 60-120PSI frequency conversion pulse.