The Pursonic tbusb180 oral care system includes a rechargeable toothbrush designed with sonic wave technology that provides 40 000 sonic strokes per minute to effectively remove plaque without irritating your gums It s ideal for those hard to reach areas and removes even the toughest stains to leave your teeth naturally whiter Features . 40000 strokers per minute. 2 minute timer with a 30 sec interval alert system. USB rechargeable toothbrush. Waterorrof design. World Wide Voltage. Upto to 2 hour battery life with bulit in lithium ion battery. USB Recharging Cable included Specifications