If your Motion Sensor is showing as offline on the SimpliSafe Mobile App, this is an indicator that the battery within the device needs to be replaced. 

The Motion Sensor takes a single (1) CR-123A Lithium 3V battery and has a life expectancy of up to 5 years depending on placement and usage.

To replace the battery, slide the sensor up and off its’ bracket. Then replace the lithium battery and slide the sensor back onto its’ bracket. You can also follow the steps here.

Please note that the error may take up to 24 hours to clear from the SimpliSafe Mobile App after taking these steps. If you want to bypass that timeframe, place your system into Test Mode and test the sensor to reestablish a connection.

To place your system into Test Mode:

1. Using your Keypad go to Menu > Enter Master PIN > Test Mode

2. Press and release the button on the Motion Sensor. The Base Station should announce “Motion Sensor” and the timeline on the SimpliSafe App should show “Motion Sensor Test”.

At this point, the error message should clear from within the SimpliSafe App and your sensor is ready to protect your home again.