Detects four types of gases: carbon monoxide (CO), hydrogen sulfide (H2S), oxygen (O2), and combustible gas (LEL). Continuously monitors CO, H2S, O2, and LEL concentrations in the surrounding environment with accurate measurement. Features sound, light, and vibration alarms that activate when gas levels reach preset thresholds. Allows user-defined alarm settings and automatic shutdown time configuration. Equipped with a large color LCD display with backlight for clear visibility. Compatible with a sampling pump for use in confined spaces. Suitable for various industrial applications including shipping, mining, oil exploration, chemical processing, gas pipeline maintenance, tunnel construction, coal, metallurgy, paper manufacturing, firefighting, municipal services, and textiles. Technical Details: - Carbon Monoxide (CO): 0–999 ppm; Resolution: 1 ppm - Hydrogen Sulfide (H2S): 0–500 ppm; Resolution: 1 ppm - Oxygen (O2): 0–30%; Resolution: 0.1% - Combustible Gas (LEL): 0–100%; Resolution: 1% - Operating current: 230 mA - Operating voltage: 3.7 V - Battery type (included): BL-9C Rechargeable battery - Operating humidity: 15%–95% RH (non-condensing) - Storage temperature: 0°C to 40°C - Short circuit current: ≤ 3 A - Maximum open circuit voltage: ≤ 4.2 V - Display type: Segment-type LCD - Operating temperature: -10°C to 50°C - Battery life: Up to 6 hours (no alarm) - Detection gases: Carbon Monoxide (CO), Hydrogen Sulfide (H2S), Oxygen (O2), Combustible Gas (LEL) - Response time: < 20 seconds - Dimensions: 75 x 138 x 43 mm - Color: As shown in images - Material: ABS plastic Package Contents: 1 x Gas Detector Note: The package includes only the items listed above. Light reflection and screen differences may cause slight variations between the product color in images and the actual item. Measurement tolerances may vary by ±1–3 cm.