Standalone Photoelectric Smoke Detector/ smoke alarm

Photoelectric Smoke Alarm                                        
1) Material: ABS plastic                                                                                       
2) Assembly no wiring, size: Dia.104xH35mm
3) Power supply:9V DC BLOCK battery/PP3(not included)
4) Standby current: 8μA, Alarm current: 16mA
5) Environment temperature: -10°C ~ +50°C                                                        
6) Environment humidity: 0 to 95%(40±2°C)
7) Alarm decibel: louder than 85dB at 10feet(3 meters)                                                                                                                                                                                         8) Test button:To verify the proper functioning of the detector                                                                                     9)Low voltage warning: Unit beeps every 40 seconds for 7 days (minimum) to indicate a need of battery replacement                                                                                                                                     
10)Smoke sensitivity:0.086 dB/m to 0.140 dB/m   
11)5 years quality guarantee