YTWO 1pc Ultrasonic Teeth Cleaner, Teeth Whitening, Electric Dental Scaler, Removes Tartar, Oral Cleaning, Recommended By Dental Experts, IPX6 Waterproof, Easily Removes Tartar, Plaque, Stains From Smoking/Coffee/Tooth Gaps, 5 Cleaning Modes (Gentle, Standard, Medium, Strong, Extra-Strong), Smart Power Distribution, Overcharge Protection, Cleans Teeth Gently, 3-Hour Full Charge, 90-Day Standby, 500mAh Large Battery