Instruction manual
3
Smoke detectors may not sense res that start where smoke cannot reach 
the detectors such as in chimneys, in walls, on roofs, or on the other side 
of closed doors. If bedroom doors are usually closed at night, detectors 
should be placed in each  bedroom as well  as  in  the common  hallway 
between them.
Smoke detectors also may not sense a re on another level of the residence 
or building. For example, a second-oor detector may not sense a rst-
oor  or basement  re.  Therefore,  detectors  should  be placed  on every 
level of a residence or building.
The horn in your detector has been tested by ETL to comply with UL 217 
(US). However, if the detector is located outside a bedroom, it may not 
wake a sound sleeper, especially if the bedroom door is closed or only partly 
open. If the detector is located on a different level of the residence than the 
bedrooms, it is even less likely to wake up people sleeping in the bedrooms. 
In such cases, the National Fire Protection Association recommends that 
the detectors be interconnected so that all detectors sound an alarm when 
any one of the detectors sense smoke.
All types of smoke detectors have limitations. No type of smoke detector 










