1, Carbon monoxide announciator, electrochemical sensors, combined with the living environment of people, through scientific design, the detection signal is very sensitive and accurate;2, The carbon monoxide detector using high-performance microcontroller, it can detect low to several PPM concentrations of carbon monoxide;3, Reset, two key test is simple and convenient, you can restart or to test environment of carbon monoxide concentration at any time;4, Just as the size of a hand, very convenient to test at different places;5, Adopt the ultra-low consumption, use 3 pieces of AA batteries(Battery not include) , the battery can be used more than 2 years in normal working environment ;Carbon monoxide gas from inside the space surrounding the alarm into the machine, after testing the output of carbon monoxide density, in the just switched on, the screen display 0 to 30 PPM is normal (1 PPM = one over of the volume)1, after installed the battery, will hear a "drop" sound, red lights flashing.(for battery installed correctly)2, when the alarm, the red light flashing quickly, and send out alarm.Restored to monitor state (carbon monoxide concentration decreases,3, when the standby, green indicator light flashing a 30 seconds.4, under normal circumstances, the LED indicator light flashing a about 40 seconds.5, such as blue backlight lights, press the "TEST" key TEST alarm emits an alarm, the red indicator light flashing, alarm is working properly.6, the alarm with the attached screw fixed on the wall.Colour:WhiteMaterial:plasticPackage Contents:1 x Carbon Monoxide Poisoning Warning Alarm DetectorOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.