Dahua Alarm Wireless Standalone Gas Detector HY-GB40A High-performance sensor, intelligent and accurate detection of gas leakage, and send out alarm signal timely Operate stably and identify gas type effectively Intelligent linkage to close pipeline valve and start exhausting fan A built-in high-volume buzzer, 70dB (A) at 1m (3.28 feet) Three indicator lights for displaying device status clearly Gas Type : Propane (C3H8) Alarm Threshold : 10% LEL Response Time : ≤30 s Supply Voltage : DC12V Power Consumption : ≤0.8W Output : 1 valve output, 1 relay output Operating Temperature : –10°C to +55°C (+14°F to +131°F) Relative Humidity : ≤95% RH (non condensing) Warm-up Period :180 s Alarm Method : Visual and audible alarm Alarm Sound Output : 70dB (A) at 1m (3.28 feet) Silence : Support Dimensions : 86.6 mm × 86.6 mm × 29.2 mm Installation : Wall mount Certification : CE