Easy to use push button control. 8 contoured contact points for soothing massage. Massage 8 points on your scalp at the same time… with 10 different patterns of Vibration, Pulsation and Escalation!Can be used alone as a vibe too!Waterproof MultispeedRequires 2 AA Batteries (Not Included)Length – 4.5 in. – ( 11.43 cm )Width – 1 in. – ( 2.54 cm )Girth – 3.5 in. – ( 8.89 cm )Weight – 10.7 oz. – ( 332.81 gram )