Fading Reminder Bristles - Come with 3 replacement brush heads, when the blue bristles on both ends fade and turn white over time, this indicates that brush heads need to be replaced for optimal results. "W" shape design Dupont bristles and small brush heads easy to reach deep between teeth for thorough cleaning, rounded bristle ends care your gums. USB 4 Hours Charging & 30 Days Batery Life - One 4 hours full charge last 30 days of normal usage (2 times per day), with low battery reminding and automatically cuts off power after full charge, Usb cable compatible with global voltage and universal USB port, no worry about charging when you are abroad or traveling. 2 minutes Smart Timer - Built in 2 minutes tooth brushing timer encourages you to achieve the dentist-recommended time, and with interval pause every 30 seconds, always let you know when to replace brushing area for an effective clean. Automatic shutdown 2 minutes later. 5 Optional Brushing Modes - White(strong), Clean(gentle), Sensitive(soft), Polish(strong invert frequency) and Massage(gentle invert frequency), customize your experience according to your teeth condition, keep your teeth healthy and strong for a lifetime. Ipx7 waterproof that whole body washable, enjoy brushing your teeth in the shower. Travel Electric Toothbrush Cleaning As Dentist - Dnsly Upgraded Electric Toothbrush with 40,000 micro-brush/min sonic dynamic cleaning to drive fluid deep between your teeth and along the gum line for exceptional cleaning and removing up to 100% plaques, significantly whitening your teeth and improving your oral health in two weeks better than a manual toothbrush.