I purchased F6 CE0537 (with chest strap N2965) one year ago. Worked well about 8 months. Then it started not showing hart rate. I changed the battery still it is not functioning properly. Sometime it will show hart rate only few minutes and goes off. Inly it shows time. That's all it shows. I paid about $120.00 for this. I appriciate your advice. Thanks.
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