Applicable gases:methane and carbon monoxide Sampling :natural diffusion sensors:semiconductor sensor and electrochemical sensor Alarm 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%RH Response time:less than Recovery time:less than alarm modes:sound and light alarm Alarm volume: or to 70dB (1 meter in front) service life:3 years Power consumption:less than 3W Measuring 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:AC100-240V Colour:White Material:ABS Size:75x40x120mm Package Contents: 1 * UL carbon monoxide gas two-in-one alarm kit Only 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.