Kratax intelligent sonic electric toothbrush uses a low-noise vibrating motor that vibrates up to 38,000 vibrations per minute, effectively cleaning teeth while protecting sensitive gums.It is recommended to use the R( Soft) mode within 1-2 weeks for the first time user, and then use other modes for cleaning, whitening, massage.Feature:USB cable charging time: about 5 hoursDuration of use: about 45 days (2 times a day, 2 minutes each time)Input voltage: 5VInput current: 500mAhWaterproof rate: IPX7Package Contents:1 x Main body2 x Brush heads1 x USB charging cable1 x Manual