Why is the green sensor light on my Vista+ device off?

The sensor light will be constantly on from the moment you turn on the 24h Atrial Fibrillation on the VyvoSmart App , meaning that it will continually measure. If that option is set on “OFF”, the sensor will only activate when you choose to perform the measurement from the device. Same thing happens with the Heart Rate sensor, so if you turn on the “Auto-Heart Rate” setting, you will automatically see the green light on. 

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