Immediately has system call you in smoke as well it sounds by itself, whenever the system is armed or disarmed.

The main technique paremeter of wireless smoke Sensor Detector:
Fire Detector Alarm intelligent degree: One class
Surveillance area: 20 square meter
Shoot frequency: 315MHz~433MHz
Shoot distance: 60~80M(open spaces)
Power dissipation: Surveillance appearance < 20uA, alarm appearance < 20mA
LED designation: Surveillance appearance LED every 40 seconds flash one time, and alarm appearance LED 1 second flash one time
Alarm output: Wireless shoot to output, LED appearance every second flash one time
Battery: 9V, model number 6F22
Auto examination: Each 1.67seconds check one time