Rechargeable Built-in rechargeable battery. 16 hours battery life.
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Built-in Memory Work stand-alone, even without smartphone. - Device can store 4 sessions data, up to 10 hours for each.
Notice: The built-in memory can store 4 sessions. The oldest will be overwritten by the 5th. Please sync data to your phone in time.
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Free App for Android and iOS Report average O2 level and heart rate, showing detailed trends in graphics.
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