Tried 3 times already. The first time the battery died after being fully charged and left idle for a few days. Then it really worked in a training session. By the third training session, he was completely dead after trying to charge it all night before, and won't come back to life after trying to charge it again for several hours. i will return it if i can. Very disappointing as I bought it to use with software at my gym to track my heart rate on real time video monitors.
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