1. Detect 4 kinds of gas: carbon monoxide(CO), hydrogen sulfide (H2S), oxygen(O2) and combustible gas(LEL).2. Continuously monitor the CO, H2S, O2 and LEL gas concentration in the surrounding environment with professional and accurate measurement.3. Sound & light vibration alarm works when one of the CO, H2S, O2 & LEL gas concentration reaches the level of the alarm.4. Can set automatic shutdown time and concentration of alarm value.5. Large color LCD display with backlight for easy reading.Can connect to a sampling pump to operate in closed place.Can be widely used in shipping, mining, oil exploitation, chemical, gas pipeline, tunnel construction, coal, metallurgy, paper, fire, municipal, textile and other industries.Technical Details:1. Carbon Monoxide(CO): 0-999pm;Resolution: 1ppm2. Hydrogen Sulfide(H2S): 0-500ppm;Resolution: 1ppm3. Oxygen(O2): 0-30%;0.1%4. Combustible Gas(LEL): 0-99%;1%5. Operation current: 230mA6. Operation voltage: 3.7V7. Battery type(include): BL-9C Rechargeable battery8. Operation humidity: 15%-95%9. Storage temperature: 0-4010. Short circuit current: less than equal 3A11. Maximum open circuit voltage: less than equal 4.2V12. Display Type: Segment type LCD13. Operation temperature: -10-5014. Battery working runtime: 6 hours(no alarm)15. Detection Gas: Carbon Monoxide(CO, Hydrogen Sulfide(H2S), Oxygen(O2), Combustible Gas(LEL)16. time: Less than 20 Seconds17. Dimension: 75x138x43mmColor:As shownMaterial:ABSPackage Contents:1 * Gas 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.