Features:
Independent smoke alarm, helping early detection of fire, keeping your family safe. 
Once the smoke attains the certain density, it can timely send out sound and light alarm signals to alert and warn people stay far away from danger field.
High sensitivity and stability, accurate detection.
Loud 85dB alarm sound is powerful enough to alert you when smoke is detected.
Suitable for fire alarm in house, factories, shopping malls, hotels, restaurants, office buildings, markets, schools, libraries, etc.
Equipped with a test button, checking the operating status of alarm at anytime.
Made of fine quality anti-flame retardant material, safe and reliable.
Powered by 1 * 9V-battery(no included), low power consumption.
Easy installation. Easy to install it on the ceiling with the screws.
 
Specifications:
Material: Flame Retardant Material
Static Current: ?12uA
Alarm Current: ?15mA
Operating Voltage: DC9V
Alarm Mode: Sound and Light Alarm
Alarm Indication: Led Flashes in Red
Alarm Sound: 85dB/3 meters
Operating Temperature: -10?~+60?
Humidity Range: ?95%RH(40±2?)

Note: This smoke detector can't work with any alarm system, it just can work alone.
 
Package:
1 * Independent Smoke Alarm(NO battery)
2 x screws
1 * User Manual?