Stops working after 30-40min

Stops working after 30-40min

Runtastic RUNBT1 Monitor helps the Heart Rate Combo Race (Sports)
Buy at Amazon.com

Customer Review

For small output rather it works correctly.

The only problem is that after 30-40 minutes of training, the sensor indicates completely erroneous heart rate (35-40 ...). It is impossible for me to monitor my heart rate during all of my output 2h ..

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