Cordless Pearl has 360 degree tip rotation, an easy to hold ergonomic design, an easy to fill water reservoir, and a convenient USB-A charging cable (wall adapter not included). Waterpik water flossers remove up to 99.9% of plaque bacteria that causes gingivitis, cavities, and bad breath from treated areas and are clinically proven up to 2X as effective as string floss for removing bacterial plaque and improving gum health.