When facing the unit, unscrew the four screws on the black drive unit. Remove the drive unit and check if the batteries are inside (replace the batteries when needed following this step). Press the test switch to see if the device is up and running.
When facing the unit, unscrew the four screws on the black drive unit. Remove the drive unit and check if the batteries are inside (replace the batteries when needed following this step). Press the test switch to see if the device is up and running.
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