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.

• Compatible with dozens of leading fitness apps
• 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.