This was made possible by the integration of an innovative flat battery and folded circuit design. It is joined by the iSPORTA Bluetooth Wireless (SRP: Because they are water resistant, the iSport Bluetooth Wireless Super Slim can be worn under a helmet comfortably for throttling up a tough mountain bike trail, while the iSPORT Bluetooth Wireless provides the ideal tangle-free solution for an arduous everyday jog in the park, in the rain or shine.