Its ideal for those hard-to-reach areas and removes even the toughest stains to leave your teeth naturally whiter! Features: 40,000 powerful sonic strokes per minute, with world wide voltage 110-220v Includes 12 color coated brush heads for multiple users Advanced electronic control and electro mechanical driving system 2 minutes auto timer with a 30 second interval alter system 3 Operations: Normal, Soft & Massage Powerful plaque remover where normal bristles cant reach, effectively removes pla