Silent Call SD4-SS - Manual (Page 17)

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every 10 seconds. If the detector is in need of maintenance because
its sensitivity has shifted outside the listed limits, the red LED blinks
once every 5 seconds. When alarm has been activated by smoke, the
red LED blinks every 1 second. The LED indication must not be used
in place of the tests specified under Testing. If the detector senses a
low battery condition, the red LED blinks once every 45 seconds.
Low Battery Detection
The Model #SD4-SS is powered by a single 3-volt CR123A or
DL123A Lithium battery (included). The detector checks for a low
battery at least every 65 minutes. In addition, the red LED of the
Model #SD4-SS will blink every 45 seconds and the test switch will
be disabled. This condition will exist for a minimum of 7 days, and
then the detector’s horn will “chirp” about every 45 seconds. Pressing
the test switch during this time will silence the chirps for 12 hours.
The battery should be replaced BEFORE the chirps begin. Be sure to
replace the battery with a fresh one.
Battery Life Expectancy
Replace the battery once a year or immediately when the low battery
indicator starts to blink and the horn begins to chirp. Replacement