Featuring revolutionary patented technology that allows & nbsp;your toothbrush to last up to a whole year on a single charge, issa™ 3 combines Sonic Pulse technology with an innovative & nbsp;bacteria-resistant silicone hybrid brush head - so you can use & nbsp;a natural manual gesture while experiencing electric & nbsp;toothbrush results. Brushing has never been so easy! Bacteria-Resistant Silicone: Made with medical-grade silicone Quick-drying and non-porous to prevent & nbsp;bacteria buildup Free of BPA & phthalates 100% waterproof so you can use it in the & nbsp;shower Hybrid Wave Brush Head: Silicone and PBT Polymer bristles combine & nbsp;to be tough on plaque and gentle on gums Concentric ridges on the back of the brush & nbsp;head clean cheeks and tongue for a true & nbsp;full-mouth clean Each replaceable brush head lasts up to 6 & nbsp;months before it needs to be replaced, for & nbsp;ultimate convenience Sonic Pulse Technology: 16 speeds of Sonic Pulse technology for & nbsp;perfectly personalized brushing 11,000 sonic pulsations per minute gently & nbsp;massage the gum line, while effectively & nbsp;cleaning each individual tooth Clinically proven to help improve overall & nbsp;oral hygiene by 140% Low Battery Indicator Light: Flashes red to indicate when battery is running low to remind you to give your toothbrush a charge - so you'll never run out of battery mid-brush again. Smart Swedish Design: USB-rechargeable, with a single 2-hour & nbsp;charge lasting up to 365 days Built-in timer vibrates every 30 seconds to & nbsp;indicate when to move to a new quadrant & nbsp;of the mouth Travel lock and travel case for ease & nbsp;on the go.