Polar Cadence sensor Bluetooth Smart

Cadence sensor. Boost your cycling performance and find out what your most efficient pedaling rate is. The sensor works with Bluetooth Smart technology and consumes only a little energy. You can later analyze your training at the Polar Flow web service. Small and light design with firm bike attachment Compatible with iPhone 4S and later, and with selected Android devices including Samsung Galaxy S3 and S4 using Android 4.3 or later.