User's Manual

functioning normally within its listed sensitivity range, the green LED
blinks once 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 the 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 specifi ed under Testing. If the detector
senses a low battery condition, the red LED blinks once every 45 sec-
onds.
Low Battery Detection:
The Model SD4-MC(US) is powered by a single 3-volt CR123A Lithium
battery. The detector checks for a low battery at least every 65 minutes.
In addition, the red LED of the Model SD4-MC(US) 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. Batteries
can be purchased directly from Silent Call Communications by calling
1-800-572-5227, or online at www.silentcall.com.