The red (X) indicates that the Vibration Sensor Node is offline.
Here are some troubleshooting tips to get it online:
- First make sure that the Base Station is online. If not, see (How to Trouble shoot a Base Station)
- Bring the sensor as close to the Base Station or repeater as possible.
- Remove the battery and reinsert it.
- The battery is held in by two T15 torxbit screws. (Version 2.0 sensors)