Light Up Bra - Sound Activated - Wavy Our out-of-site sexy bra with sound activation, this bra will blink to the beat of music! This rave bra has 3 colors of ultra bright el wire lights in a wild wavy pattern. Superior quality professionally hand sewn el wire and includes a 4 setting battery pack featuring on, sound activated, strobe, and off modes. Top quality push up bra, underwire cups for support with adjustable straps and back closure. Batteries: 2 AAA, can be replaced as often as you like. Battery pack clips securely on the back of the bra is easily accessible and discreet so that you wont even know its there.