The Oral-B iO Series 2 rechargeable toothbrush combines powerful, yet gentle micro-vibrations with Oral-B's unique dentist-inspired round brush head design for a professional clean feeling every day. The Smart Pressure Sensor indicates optimal cleaning pressure to protect gum and enamel. The frictionless, smooth magnetic drive system transfers energy to the bristle tips. Replace your Oral-B iO Series Replacement Brush Heads every 3 months for best results. Toothbrush has a 30-day Risk Free Trial and a 2 year warranty from Braun Oral-B.