it adopts thermistor sensor and photoelectric infrared LED indication, tamper switch button, built-in buzzer, exact detect smog density when it over the standard level (UI 217 / 3.2%/feet), it can make the alarm by itself via built-in buzzer, and also send out the wireless alarm signal to alarm control panel at the same time, low battery indication that make once sound in each 2 hours via built-in buzzer, easy to install on ceiling or wall using the screws with countersink heads which had packed in the package.
Working voltage: 12V non-polar power supply
Working environment: temperature -5 ℃ ~50 ℃; humidity 10% -90%
Alarm output indication: The red LED is always on
NO output mode: monitor current <2mA, alarm current <30mA
NC output mode: monitor current <30mA, alarm current <10mA
Size: (φ * H) 108 * 40mm