The Eve 3 Function Body Responsive Vibe works like magic!! There are three pleasure sensors running down the shaft vibrate and each sensor has its own vibration pattern and as you push deeper the clever bands sense where you are and reward you by increasing the intensity and pulsing. The vibe features a one touch sleek on and off button and a harder body to deliver maximum vibrations. Waterproof. High - high intensity, Pulse - for on and off stimulation, and Low - building vibration. Requires x2 AAA Batteries Not included.