Feature:1. Gas Detector: When the concentration of the detected gas exceeds the set alarm value, a sound and light screen alarm prompt is displayed, high accuracy.2. Wide Application: Suitable for gas leakage, underground pipelines, mine metallurgy, power plants, chemical engineering, tunnel operations, tunnels, and other places to ensure personnel safety.3. Leakage Detection: When the gas concentration exceeds the safety value of 20% LFL, the bottom color of the screen will be a red index grid. The rising will be accompanied by a rapid beep alarm. And when the gas concentration does not exceed 20% LFL safety value, the bottom color of the screen is green and there is no rising index grid or buzzing alarm, it is considered safe.4. High Accuracy: Detection range of 300~10000PPM, dual color LCD display of beep alarm, high accuracy gas sensitive semiconductor sensor, high and low sensitivity can be switched.5. Easy Location: Along the gas pipe of the water heater, when the bottom color of the screen is red and the index grid rises and accompanies, the current position is the gas leakage point with the rapid beep alarm.6. Automatic Shutdown: Without any button operation or measurement signal, the detector will automatically shut down after about 5 minutes, saving power and worry.Specification:Item Type: Gas DetectorProduct Model: GN801Material: ABSDetection Range: 300~10000ppmSensor: Gas sensitive semiconductor. Response Time: <=500ppm: about 5 seconds. >500ppm: about 2 seconds. Response Sensitivity: <50ppm for methane. Alarm Function: The prompt sound can be adjusted to mute. Preheating Time: About 30 SecondsAutomatic Shutdown: No operation or measurement within 5 minutes, it will automatically shut down. Adjustable Sensitivity: H high sensitivity, L low sensitivity. Battery: 2 x AAA battery, shipped without battery. .Package List:1 xGas Detector1 x Cross Screwdriver1 x User Manual