Back Door Entry with this whisper-quiet motor delivers mind blowing vibrations directly to your most sensitive spot. With one solid click of the button, you will go from flutter to a throb in seconds. Ultra-hygienic silicone, hypoallergenic, firm yet super flexible and an easy grip. Easy cleanup, waterproof. Requires 1 AA battery. Length is 4.25 in., 3.5 in. insertable. Diameter ranges between 0.75 in. and 1.125 in.