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Charging method: USB port Battery: lithium battery Capacity: 14500/800 Rated voltage: 3.7V Rated current: 200mA Power: 0.6W Power adapter: 5V Vibration frequency: 38,000 times/minute Charging time: 2H Waterproof grade: IPX6 Net product quantity 60.5g Packing weight 153g Product size 21.5 * 2.5 * 2.5cm Packing size 24.5 * 10 * 3.5cm Packing quantity 50/box Packing weight 8.3kg Packing size 55 * 37 * 26cm Product features 1. High-frequency vibration, silent 2. USB charging, long battery life 3. Five modes, one-click switching 4. IPX6 waterproof 5. Food-grade teeth Remarks 1. Food-grade alloy steel, safe and hygienic 2. High frequency 31000 times/minute, decontamination does not hurt teeth null null