1) The home photo-electric smoke detector designs as special optical dispersionprinciple, it could detect the smoke on fire and give alarm

2) It is the red environmental protection detector

3) There have the buzzer and fire indicator light in inner, it could give the obvious sound and light alarm

4) Technique parameters:

A) Power: DC9V layer battery

B) Sensitivity: III level

C) Stakeout current: <20uA

D) Working current: ??10mA

E) Alarm sound: >80dB above

F) Temperature: 0 ~ +40ºC

G) Humidity ??95%, Non condensing

H) Battery life: 1 year