Product description:

model AK-218A, a smoke alarm detector that is ideal for home safety system. The smoke alarm will give out sound and light warning when there is smoke. A smoke alarm is a safety product that warns you a potential fire maight happen. This smoke detector has the characters of high sentivity, fairly good stability and low power comsuption . we will offer you the smoke alarm with the best quality and the most competive price.

10VAC/220VAC/230VAC( backup 9v battery),9v battery,12V-24VDC
2,Operating Current: 10 uA (normal) and 20-50 mA(alarm working)
3,Sensitivity to smoke:In comply with CE standard
4,Operating Temperature: 40℉ - 100℉ (4. 4℃ - 37.8℃)
  Ambient Humidity : 10% - 90%.
  Horn Level: 85 Decibels at 10 feet.
5,Battery life: 1 year
6,Interconnecting Gas detector  
  (1)Circuit for normally closed relay contacts
  (2)Circuit for normally opened relay contacts
  (3)Operating Frequency: 433 MHZ/315MHZ (optional)
7,Size:125mm*30mm
8,Weight:168g/pc
9,Package size:58.5cm*42.5cm*30.6cm
10,Quantity/Box:80pcs
11,CtnWei(kg):17.5kg
12,Q`CTY/20`FT:33920pcs