1.The SR-820PHS is Photoelectric Smoke detector alarm (independent) with 9v battery operated
2.Infrared photoelectric sensor
3.MCU processing, eliminate false alarm
4.Photoelectric sensing technology
5.Dustproof, mothproof, anti-light interference design
6.Hush function and Auto-check malfunction
7.Lower battery indication
8.Execute criterion: EN14606; UL217

Technological details                                                                                                                         
Operating voltage:    9V battery
Hush function:    YES
Material of the shell:    ABS+PC
Sensitivity:    2.06%ft±1.3%ft
Sound level:    85dB/3m
Installation:    Wall  or Ceiling mounted
Working environment:     -10℃~+50℃(≤95%RH No congelation)
function:    Hush function and Auto-check malfunction
Execute criterion:       EN14606; UL217
Dimension:    128*38mm