Battery:Built-in Storage BatteryModel Number:Hair Growth CombBrand Name:K-SKINOrigin:Mainland ChinaCertification:CETechnical parameters Voltage: 3.7V Charging voltage: 5V Charging current: 2A Battery: 1800Mah Maximum power: 4.5W Gear: strong and weak 3 gearsWorking time: 100 minutes Charging time: 90 minutes RF frequency: 210KHz EMS frequency: 5-10KHz LED: red + blue light Mode: 3 modes (RF mode, vibration mode, EMS) Product Features 1, 210kHz radio frequency energy 2, Medium and high frequency deep EMS 3, 5 mW high power laser light 4, LED infrared light + blue light lamp 5, Ultrasonic vibration technology6, No operation 10 minutes automatic shutdown7, IPX6 waterproof 8, 20 stainless steel comb teeth Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.