Note: It is suggested that you should replace the brush head every 3 mouths. When brushing your teeth, the bristles should be 45 degrees to the gums. Specification: Material: ABS/TPE /DuPont nylon bristle Charging mode: 5V-USB charging Voltage: 3.7V Power: 0.5W Product Features: •Powerful cleaning up to 41000 strokes per minute •3 HOURS CHARGE FOR MINIUM 15 DAYS USE •Gently and effectively reaches deep between teeth and along the gumline •2 minutes auto timer, 30-seconds intervals to ensure thourough brushing in four quadrants •IPX-7 waterproof to be used at bath and shower •Long battery Ilife, supported by USB charging , safe and easy auto shut off after full charge , compatible with any power source •Tooth-waved bristles made with Dupont nylon , to suit teeth topography for through cleaning of gums and hard to reach areas Features: 1. Imported food grade DuPont brush, anti-shedding, anti-scattering, rounding process 2, five vibration modes clean, sensitive, massage, solve various oral problems 3, body waterproof design, the body can withstand water flow washing and intrusion, base IXP7 waterproof Package Include: 1x toothbrush 4 x pieces toothbrush heads 1 x USB Charger