Silent Call SD4-SS - Manual (Page 15)

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the detector to automatically maintain proper operation at factory
calibrated detection levels, even when sensitivity is altered due to the
presence of contaminants settling into the unit’s smoke chamber. In
order for this feature to work properly, the chamber must never be
opened while power is applied to the smoke detector. This includes
cleaning, maintenance or screen replacement.
The Model #SD4-SS contains a piezoelectric horn which generates
the ANSI S3.41 temporal pattern in an alarm condition. During an
alarm condition, pressing the detector’s test switch will silence the
piezoelectric horn for 5 minutes. The built-in Drift Compensation
algorithm automatically maintains the sensitivity of the detector.
The mounting base installation is simplified by the incorporation
of features compatible with drywall fasteners or other methods that
provide a method for securing the detector in place.
An indication that current studies have shown smoke alarms may not
awaken all sleeping individuals, and that it is the responsibility of
individuals in the household that are capable of assisting others to provide
assistance to those who may not be awakened by the alarm sound, or to
those who may be incapable of safely evacuating the area unassisted.