Low Battery Warning; Supervision - Watchguard N517Series II User Manual

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3.8.6. Low Battery Warning

If the detector has near flat batteries, then on a valid movement detection the red light
will flash 6 times in a row instead of once. The detector will also send a low battery
radio transmission at this time. The batteries should be replaced immediately.
Another way of testing for low battery is by removing the front cover to release the
tamper switch. When the cover is opened and the tamper switch is released, the
detector will enter test mode. Both red & green lights flash 6 times. If the detector has
low battery voltage then the red light will flash an additional 6 times in a row. The
detector will send a low battery radio transmission to your Watchguard main unit. The
batteries should be replaced immediately.
The detector constantly monitors for low battery and will send a low battery
transmission within 2.5 hours of identifying a low battery.

3.8.7. Supervision

Every 2.5 hours (approximately) the detector will send a supervision transmission.
This is used as a security measure to alert the user(s) of the system if a detector is no
longer functioning or if the detector has been taken out of receiving range of the
wireless system.