this pink vibrator is unique by the swooping lifelike movements of the thickened head.the hammer vibe is a powerful tool by the three different impact speeds. the vibrator is made of flexible silicone and has a non-slip surface for optimum friction.the various functions of the hammer vibrator are easy to operate with push buttons. the required 4 x aa batteries are not included.as with all our other intimate toys, we recommend to use sufficient water-based lubricant. this beautifully designed and very complete vibrator lets you enjoy a wonderful moment for yourself. so order now! features of the hammer vibrator:- total length: 30 cm- penetration depth: 21 cm- diameter: 4 cm- material: silicone- color: blue- operation: push button- plasticizer free: yes- requires 4 x aa batteries (not included).