PRO HOME & TRAVEL SYSTEM FOR 2 – World class oral care gets even better with Duo Pro. Duo Pro features 2 IPX7 waterproof midnight black and optic white smart toothbrushes with 40,000VPM ultrasonic motors, lithium-ion batteries (30 days on a single charge), 4 unique modes with smart timers, and true wireless charging. A new UV sanitizing and wireless charging dock with autotimer kills 99.99% of germs. Duo Pro features 10 ProFlex brush heads and 2 custom travel cases for a total of 15 items.