InSite CRF103 Soccer Ball Child Locator with Parent Transmitter Works at up to 75 feet or greater Parent's keychain transmitter is used to ring the ball The loud and distinct 88dB ring brings instant attention to child's location Receiver can be laced into shoe Includes Parent keychain transmitter, child soccer ball receiver, batteries (CR2032 x 2) (23AE 12V x 1), velcro strap, user manual, and warranty