Taking care of your oral health is easy with the Philips Sonicare DiamondClean Toothbrush. This rechargeable power toothbrush offers Sonicare's best plaque removal and whitening system, featuring patented Sonic technology and brush heads with diamond-shaped bristles that gently brush away plaque. Five cleaning modes provide a custom cleaning experience, and the Smartimer and Quadpacer ensure you brush adequately and evenly. For your convenience, DiamondClean includes a sleek charging glass and a USB charging travel case. The product needs to be charged for at least 24 hours in order to fully charge the battery.The product may still deliver up to an additional 12 uses after the battery indicator has first started to flash in an amber color. The amber color is an indicator that the handle needs to be charged. When charging multiple products be sure to have them sufficiently spaced apart [at least six inches]; when placed closer together, products may not charge correctly.