PS:This type smoke detector can not work any home alarm system,it just can work alone.So if you want to order the one to work with alarm system,you can click the web link below,thank you.

Item Information

Features:
Alarm volume: 85 dB
Fire Smoke Detector Alarm, general purpose ideal for all areas : house, shop, hotel, restaurant, office building, school, bank, library, computer house and storehouse etc.
Alert and warn people stay far away from danger field when it detected smoke.
The detector adopts the special structure design and ASIC, has the dustproof, mothproof and anti outside light interference feature etc.
Alarm test button
Easy to install
Photoelectric sensor for early detection from all directions

Specifications:
Size: R=102mm, H= 31mm
Net weight:150g

Power supply:9V battery*1
Package weight:170g

Packing content:
1 x Smoke alarm(without battery)