The description of smoke detector

1. 240V/50Hz with 9VDC battery backup
2. Battery:1 year
3.Conforms to EN14604, UL217,AS3786 standard
4.Loud>85dB(A)alarm signal @3M
5.Low battery signal alarm
6.Photoelectric smoke chamber
7.Interconnect upto 12 pcs
8.Test button for easy recommended monthly testing
9.Safety clip feature, not allow mounting of smoke alarm  without battery installed
10.Silence function
11.Fault warning
12.Silence time:10 minutes
13.Standby indicator:Red LED flashes every 40 seconds

14. Size Ø127x41.3mm