Designed to provide pleasurable vibrations while building and toning pelvic floor muscles. The Plum Vibrating Kegel Ball features 6 vibration modes that are extremely quiet. The ball is 1.38 in. deep and 1.57 in. wide with a total length of 4.33 in. including the pull cord. It is extremely quiet, waterproof and you can use it anywhere at any time. Operates up to 40 minutes on 3 LR44 batteries, included.