In order to make your HR40 function well,we propose you try as belows:
1. Replace a new battery with model CR2032.
2. Maintain your strap:
- Wet the electrode area of the chest strap.
- Adjust the strap length to make sure the wet electrode area touch firmly with your body.
- Make sure L side is on the left side of your body and the iGPSPORT LOGO is upwards.
- Hand wash the strap with clean water and natural drying it, no machine washing and no chemistry cleaner.
3. Test the functionality of your HR40:
- Download an APP named "nRF toolbox" in google play.
- Change a new battery and follow the video to search the HR40 from the APP.
If you need more help,pls contact us at firstname.lastname@example.org