Convenient and Safe - The rechargeable oral irrigator with powerful lithium battery can be fully charged in 4 hours, you can charge it with computer, power adapter, power bank or car charger. Adapter is not included. FDA approved. Extra-Quiet Design - Thanks to updated water pumper, HOC700 water flosser noise level is ?55db, you can use it in the morning and late night without disturbing others. 300ML Detachable Water Tank - Extra large 300ml water reservoir allows you to thoroughly clean the scales and dental plaque. Equipped with 4 interchangeable nozzles for use by different members of the family. 3 Modes & 4 Nozzles - Select "NORMAL" for powerful removal of food particles, "SOFT" for gentle to clean sensitive teeth, "PULSE" for massaging gum and rinsing. 1,600 Pulses Per Minute Maximum - Deeply cleanse between teeth and below the gingival margin, utilizes a combination of water pressure and pulsations cleans deep between teeth and below the gum line where regular flossing can't reach.