Sonicare technology pulses water gently between your teeth for an expert at-home cleaning, removing more plaque than manual brushing Two intensity level options allow you to brush gently yet effectively Two-minute SmartTimer with QuadPacer encourages you to brush for the dentist-recommended amount of time Slim, ergonomic handle design makes it comfortable and easy to hold Pressure sensor flashes red to prevent the user from applying too much pressure Brush head replacement reminder alerts you when it's time to switch to a new brush head Built-in battery lasts for up to 14 days on one charge, with a battery light indicator for at-a-glance battery checks