TZ4000 Toothbrush. Superior plaque removal. 7 day long-lasting battery. Built In Timer. Oral-B TriZone 4000 is a triple-action, deep cleaning toothbrush designed around the way you naturally brush. The revolutionary technology combines the familiar brushing motion of a manual brush with the power of advanced triple zone cleaning action to give you a long-lasting clean. With 40,000 pulsations and 8,800 sweeps per minute. The Triple Zone experience The first of its kind, the brush head of the TriZone 4000 is divided into three cleaning zones to keep your teeth and gums healthy: ZONE 1: The dynamic angled power tip is designed to access hard-to-reach areas like the very back. ZONE 2: Non-sweeping bristles pulsate on the entire surface of your teeth to fight plaque build-up. ZONE 3: Sweeping, pulsating bristles reach deep between teeth. TriZone gives Powered, Sweeping and Stationary brush heads. 3 modes: daily clean, sensitive for gentler cleaning & polish to remove stains. Multi-dimensional cleaning action: Provides 40,000 pulsations and 8,800 sweeps per minute. Waterproof handle has a non-slip grip for complete control.