The Bump n' Grind penetrates comfortably and immediately begins seeking, finding and pleasing your or your partner's inner erogenous zones. If you're more in the mood for outer stimulation, great! The Bump n' Grind's smooth, tapered tip is perfect for that, too.The Bump n' Grind is easy to clean before and after playtime using warm soapy water or a toy cleaner. Compatible with any favorite water based lubricant. Requires 2 AAA batteries.