You can just use it in bathroom or kitchen. Waterproof features are safe for you and your family in daily use. FULLY COMPATIBLE - Compatible with Pro 600, 650, 680, 2500, 2900, 3000, 3500, 3900 / Smart 4000, 5000, 6000N / Kids Ages 6+, Ages 3+ / Vitality Pro, Plus, 170, 100 / Genius X, 8000, 9000 / iO 4, iO 5, iO 6 etc. for 3757 3766 3765 3710 3772 Toothbrush.
eBay