The One cleans teeth for a brighter whiter smile. Uses micro-vibrations and and contoured bristles to gently clean and polish. Buzzes every 30 seconds to encourage moving to another section of the mouth. Take it with you using the sleek lightweight and portable case. Use for 90 days with a single AAA battery. Subscribe to replacement brush heads that are delivered to your home. Includes: Philips One handle. Philips One brush head. Travel case. 1 AAA battery.