The Runtastic Speed & Cadence Sensor, in combination with the Runtastic Road Bike or Runtastic Mountain Bike app, turns your smartphone into a professional cycling computer. Record your speed, cadence, GPS position, distance, altitude, & much more. Following your ride, you can evaluate your training & analyse your performance. Together with the Runtastic Bluetooth Smart Combo Heart Rate Monitor, you can also record & evaluate your heart rate. Furthermore, you can use the Runtastic Bike Case to easily & safely mount your smartphone on the handlebars or handlebar stem of your bike. Compatible Apps:* Runtastic Road Bike App for i OS* Runtastic Mountain Bike App for i OS