Feature: 1. One machine with multiple functions. It adopts catalytic combustion sensor, which can accurately detect a variety of combustible gases. 2. Suitable for many occasions: homes, schools, restaurants, companies, warehouses, hotels, shopping malls and other places. 3. Gas detector can always protect your happiness and safe life and stay away from danger, eliminate hidden dangers. 4. Detection of heavier than air gases, such as liquefied petroleum gas, should be installed approx. 0.3‑1.0m/11.8 ‑ 39.4in above the ground and within approx. 1.5m/59.1in of the gas source radius. 5. Detect lighter than air gases, such as natural gas, coal gas, artificial biogas, installed approx. 0.3‑1.0m/11.8 ‑ 39.4in below the ceiling, within approx. 1.5m/59.1in from the gas source radius. Specification: Item Type: Gas Detector Material: ABS Application: Applicable to families, schools, restaurants, companies, warehouses, hotels, shopping malls and other places Working Voltage: 85 - 260V Alarm Concentration: 10%LEL Alarm Sound Pressure: ≥ 85dB/m Operating Temperature: -10℃ - 50℃ Working Humidity: ≤95%RH. Package List: 1 x Gas Detector2 x Screw2 x Expansion Tube1 x Manual