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Most carbon zinc batteries have an average service life
of 1 year; most alkaline batteries have an average serv-
ice life of 1-2 years; most Lithium batteries have an
average service life of 6-10 years. Actual service life
depends on the smoke alarm and the environment in
which it is installed. All the batteries specified above
are acceptable replacement batteries for this unit.
Regardless of the manufacturer’s suggested battery
life, you MUST replace the battery immediately once
the unit starts “chirping” (the “low battery warning”).
IF THIS SMOKE ALARM SOUNDS
If the alarm sounds and you are not testing it, it is
warning you of a potentially dangerous situation
that requires your immediate attention.
NEVER ignore any alarm. Ignoring the alarm may
result in injury or death. If the unit alarms and you
are not absolutely certain of the source of the
smoke, get everyone out of the house immediately.
Responding To An Alarm
If the unit alarms and you are not absolutely certain of
the source of the smoke, get everyone out of the
dwelling immediately. Stay calm and follow your family
escape plan. Stay as low to the ground as possible,
and cover your mouth with a damp cloth. Never open a
door before testing to see if it is hot. Call the Fire
Department from outside, and give them your address
then name. Read “What To Do In Case Of Fire” at the
end of this manual for more information. If the unit
alarms and you are certain that the source of smoke
is not a fire—cooking smoke or an extremely dusty fur-
nace, for example—open a nearby window or
door
and fan the smoke away from the unit (Model
4120SB Only: use the Silence Feature to silence the
alarm). This will silence the alarm, and once the
smoke clears the unit will reset itself automatically.
NOTE: When an interconnected system of AC
powered units is in alarm, the alarm indicator light on
the unit(s) that initiated the alarm will blink rapidly. It
will remain OFF on any remaining units.
Never disconnect the AC power to quiet an
unwanted alarm. Disconnecting the power
disables the Smoke Alarm so it cannot sense
smoke. This will remove your protection.
ELECTRICAL SHOCK HAZARD: Attempting to dis-
connect the power connector from the unit when
the power is on may result in electrical shock,
serious injury or death.