Smoke alarms blow their alarm horn when they detect smoke. Everything preventing the smoke from reaching the alarm obstructs an early alarm. A single smoke detector provides only limited security. Fire in another room will only be detected after smoke reaches the alarm.
Fully automatic test function
Battery warning function
Noisy (85 dBA) piezoelectric warning sound
9 Volt battery (included)
Designed for the fastest possible installation
Package Include :
2 x Smoke Detector
2 x Battery
4 x Screws
Note : No retail package to save the cost and protect environment.