Gas detector device WADFOW WGH1503

Range: 50 ~ 1000 parts per million (methane) gas detection: flammable gas response sensitivity: <50PPM response time: <=500PPM: 5 seconds; >=500 parts per million: 2 seconds warm-up time: about 30 seconds alarm mode: analog display and wind chimes environment of use: 0-50 degrees Celsius / 20-80% relative humidity storage environment: -10~60 degrees Celsius / 20-80% relative humidity with 2 pieces of R03 AAA batteries packed in a color box