The battery level might be too low, or the offline measurement function is disabled.
To enable an offline measurement, the monitor must be connected to your device via Bluetooth first. Launch the app and select the gear icon in the bottom right corner, followed by device setting, BP7XXXX and toggle “Offline Measurement” ON. *Please not the Offline Measurement feature can be only be turned on for one compatible iOS/Android device at a time.
Make sure the monitor’s battery is charged prior to its first use.