Introducing the Duo Professional Series. Upgraded features include new smart toothbrushes with rechargeable lithium Ion batteries (1 charge = 30 days of use), upgraded ProFlex brush heads, and 4 improved modes with smart timers. A new UV sanitizing and true wireless charging base with auto timer kills 99.99% that can remain even after rinsing. Duo Pro comes complete with 10 brush heads and 2 travel cases for a total of 15 items included in the box. Four brushing modes to meet different needs. Size: 12" H x 6" L x 3" W. Color: Black and White. UV Sanitizing Wireless Charging Base. 10 replaceable brush heads. Ergonomic satin grip-SmartTimer (set at 2 minutes of cleaning/30 seconds per quadrant). IPX7 rated waterproof design. Lithium-ion battery. Up to 4 full weeks (2 min/2x a day) of battery charge. 40,000 vibrations per minute. For directions, see "Additional Info". ImportedCleansing Modes:. Clean: for standard brushing. Soft: for sensitive teeth. Whiten: uses the full 40,000 VPM to dissolve surface stains and whiten teeth over time. Massage: uses pulsating vibrations to boost blood circulation around teeth and gums to improve complete oral health profileSet includes:. 2 Electric Toothbrushes. UV Sanitizing Wireless Charging Base. 10 ProFlex brush heads. 2 Custom Travel Cases. User Manual