... 3).Rechargeble. DES31 Rechargeable electric toothbrush with uv sanitizer for adult:1,31,000~40,000 powerful sonic strokes per minute ;2,Advanced ... 7,Extra long usage time;8,IPX7 waterproof design.UV sanitizer:1,Utilizes germicidal UV bulb to kill over 99.9% bacterium2, ... 7 minutes sanitizing timer control3, Sanitizer chamber can store 4pcs ...