This bike speedometer sensor can sense the speed of pedal return and wheel running. It can be connected with iOS App with low power Bluetooth 4.0 wireless interface. And transfer the above speed data to your IPHONE 4S/5/iPad mini program. Therefore you can analyze the training result while riding and turn your iOS device to bicycle speedometer device. You don't need extra converter, only transfer with wireless.

Compatible with smartphone like IPHONE 4S, IPHONE 5, New iPad & iPad Mini.

Features:

Measure bike riding speed and pedal rhythm;

Bluetooth data transmission (support Bluetooth version 4.0) IPHONE 4S / 5 and etc.

Can turn your smartphone to professional bike computer