Body safe and extremely low maintenance, the Flexer's hypoallergenic surface cleans easily and thoroughly using warm soapy water or a good toy care formulation. Ultra receptive to temperature, the vibe's blissful bumps warm quickly and naturally to meet body heat during play. Always enjoy a great quality water-based lubricant with the Bender, silicone lubes should be avoided. Requires 2 AAA batteries (sold separately). Waterproof.