Applicable gases:methane and carbon monoxideSampling :natural diffusionsensors:semiconductor sensor and electrochemical sensorAlarm setting value:methane 5LEL% 3 Carbon monoxide gas alarm value:No alarm will sound for concentrations 50 .When the concentration is 50 to 99 , the alarm will sound within 60-90 minutes.When the concentration is 100 to 299 , the alarm will sound within 10-40 minutes.When the concentration is or to 300 , an alarm will sound within 3 minutes.Environmental conditions:indoor temperature is -10C-55C, relative humidity is less than or to 95%RHResponse time:less than Recovery time:less than alarm modes:sound and light alarmAlarm volume: or to 70dB (1 meter in front)service life:3 yearsPower consumption:less than 3WMeasuring range:0-20% for methane, 0-999PPM for carbon monoxide.output contacts:pulse DC12V or 12V manipulator signal, : 1.Plug Type:EU Plug,it applies to Indonesia, Germany, , , Italy and so on.Voltage:AC100-240VColour:WhiteMaterial:ABSSize:75x40x120mmPackage Contents:1 * UL carbon monoxide gas two-in-one alarm kitOnly 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.