Ammunition for Lovers. Take aim and fire with the Worlds most powerful micro vibe. Pin point accurate stimulation at the press of a button.100% waterproof, the RO-80MM provides targeted relief even in the hot tub. 1 x 1.5V LR1 / N Size / AM5 battery supplied.Silent and Deadly!** Please note- there is a paper in the battery compartment that needs to be removed before vibe will work.