How do I check a WanderGuard BLUE Tag battery level?
Turn on the WanderGuard BLUE Detector by short-clicking the power button and place the Tag within the LF range of the Detector (less than 0.5 meter). The Detector will display the Tag battery level by flashing the Tag Battery LED—green for good battery or red for low battery—after receiving the BLE message from the Tag. It is recommended to check Tag battery at least once a week.
From the official Stanley WanderGuard BLUE Tag Wandering Prevention System manual, page 73
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