Features:

- 2 transmission modes： 5.3Khz and Bluetooth 4.0

- Wireless Heart Rate Monitor for Bluetooth Smart Ready Devices

- Tracks Heart Rate, Calculate Calories Burned Accurately

- Comfortable and Adjustable Chest Strap (Length from 60cm to 88cm)

- Includes Fitness App

- Compatible with most heart rate fitness apps on APP STORE

- Work with Polar Heart Rate Watch Adopting 5.3K Transmission

- Work with All Heart Rate Watches

- Work with smartphone running Android 4.2 and up, and iOS6  or newer.

- Compatiable with Treadmills

- Receive Distance up to 10 meters