1. Detect 4 kinds of gas: carbon monoxide(CO), hydrogen sulfide (H2S), oxygen(O2) and combustible gas(LEL).<br> 2. Continuously monitor the CO, H2S, O2 and LEL gas concentration in the surrounding environment with professional and accurate measurement.<br> 3. Sound & light vibration alarm works when one of the CO, H2S, O2 & LEL gas concentration reaches the level of the alarm.<br> 4. Can set automatic shutdown time and concentration of alarm value.<br> 5. Large color LCD display with backlight for easy reading.<br> Can connect to a sampling pump to operate in closed place.<br> Can be widely used in shipping, mining, oil exploitation, chemical, gas pipeline, tunnel construction, coal, metallurgy, paper, fire, municipal, textile and other industries.<br> Technical Details:<br> 1. Carbon Monoxide(CO): 0-999pm;Resolution: 1ppm<br> 2. Hydrogen Sulfide(H2S): 0-500ppm;Resolution: 1ppm<br> 3. Oxygen(O2): 0-30%;0.1%<br> 4. Combustible Gas(LEL): 0-100%;1%<br> 5. Operation current: 230mA<br> 6. Operation voltage: 3.7V<br> 7. Battery type(include): BL-9C Rechargeable battery<br> 8. Operation humidity: 15%-95%<br> 9. Storage temperature: 0-40<br> 10. Short circuit current: less than equal 3A<br> 11. Maximum open circuit voltage: less than equal 4.2V<br> 12. Display Type: Segment type LCD<br> 13. Operation temperature: -10-50<br> 14. Battery working runtime: 6 hours(no alarm)<br> 15. Detection Gas: Carbon Monoxide(CO, Hydrogen Sulfide(H2S), Oxygen(O2), Combustible Gas(LEL)<br> 16. time: Less than 20 Seconds<br> 17. Dimension: 75x138x43mm<br> Color:As shown<br> Material:ABS<br> Package Contents:<br> 1 * Gas Detector<br> Only the above package content, other products are not included.<br> 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.