iBike Coach Cycling Computer for iPhone 3G, 3GS, 4/4S A lightweight and strong, black-anodized aluminum bracket with stainless steel thumb screw ensures the secure attachment of the iBike Coach to your bike. The iBike Coach has durable and resilient ABS plastic construction, reinforced with a strength-increasing internal rib cage, carefully absorbs shock. A watertight gasket seal on the door of the Coach locks out moisture, and a glare-reducing touch screen cover keeps water from making contact with the surface of your iPhone or iPod Touch screen. INCREDIBLY DETAILED TOUCH-CONTROLLED COLOR SCREENS, WITH INTUITIVE GRAPHICS AND ANIMATION SEAMLESS OPERATION WITH PHONE AND MUSIC FUNCTIONS (requires wireless Bluetooth headset, not included)