The Jarv Bluetooth 4.0 Cycling Speed and Cadence Bike Sensor is designed for the iPhone 4S, iPhone 5/5C/5S, iPod touch 5, and other iOS bluetooth devices. The bike sensor together with 3rd party iOS App turns your iPhone into a professional cycling computer. It connects wirelessly via Bluetooth® Smart technology to your iOS device without the need for any adapter and delivers accurate real-time cadence and speed data. The Bluetooth Smart Bike Sensor works with most iOS fitness and sports Apps.