This professional 4 in 1 gas detector is designed for detecting CO, HS, O and LEL gas. It can continuously monitor the CO, HS, O and LEL gas concentration in the surrounding environment, once the gas concentration reaches the level of the alarm, the alarm will sound, light and vibrate. High precision portable CO, HS, O and LEL gas tester with compact size and light weight, very easy to carry and operate. Features: Detect 4 kinds of gas: carbon monoxide(CO), hydrogen sulfide(HS), oxygen(O) and combustible gas(LEL). Continuously monitor the CO, HS, O and LEL gas concentration in the surrounding environment with professional and accurate measurement. Sound & light vibration alarm works when one of the CO, HS, O & LEL gas concentration reaches the level of the alarm. Can set automatic shutdown time and concentration of alarm value. 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. Specifications: Name: SMART SENSOR Color: Orange Material: ABS Plastic Display: Color LCD Backlight Display Screen Size: 47 * 38mm / 1.9 * 1.5in Input: 100-240V, 50-60Hz Sensor: Electrochemical Principle Duty Cycle: 2 Years Explosion Proof: Protection Grade: IP65 Detection Gas: Carbon Monoxide(CO, Hydrogen Sulfide(HS), Oxygen(O), Combustible Gas(LEL) Measurement Range: CO: 0999ppm, HS: 0500ppm, O: 030%VOL, LEL: 0100%LEL Resolution: CO: 1ppm, HS: 1ppm, O: 0.1%VOL, LEL: 1%LEL Accuracy: CO: 10%, HS:5%, O: 3%FS, LEL: 5%FS Alarm: Sound & Light Vibration Alarm (Alarm value can be set) Alarm Point: Low Alarm Point CO: 35ppm, HS: 10ppm, O: 19.5%VOL, LEL: 10%LEL High Alarm Point CO: 70ppm, HS: 20ppm, O: 22.5%VOL, LEL: 20%LEL Alarm Sound: up to 80dB Response Time: Instantaneous Warm-Up Time: 20 Seconds Continuous Operation Time: 6 hours(slightly vary with working condition) Power Supply: 1 * Rechargeable BL-9C Lithium-ion 3.7V 2500mAh Battery (Built-in) Operating Temperature: -1050 / 14122 Operation Humidity: 15%95%RH (non condensation) Product Size: Approx. 140 * 75 * 43mm / 5.5 * 3.0 * 1.7in Size of the Storage Box: 230 * 205 * 50mm / 9.1 * 8.1 * 2.0in Product Weight: Approx. 249g / 8.8oz Package Size: Approx. 25.5 * 21 * 5.5cm / 10.0 * 8.3 * 2.2in Package Weight: Approx. 753g / 26.6oz Package List: 1 * 4 in 1 Gas Detector 1 * USB Line 1 * Storage Box 1 * Use Manual (English)