BESTEK Plug-In Combustible Gas Detector Alarm Sensor Natural Gas Leak Sensor Detector Alarm with Voice Warning and LED Indicator Warning Alarm Wired Combustible Gas Detector Sensor for detecting leaking of gas, natural gas, and liquefied petroleum gas. MCU Processing Adopted, High reliability and High Stability. Auto Low Battery Warning, Intelligent Microprocessor Control, and Alarm Memory Function. When a dangerous level of gas is detected, the red light will pulse and a loud alarm pattern will sound. Alarm output: sound (70dB/m) and LED flashing indicator ( red light ) , Automatic reset after alarm. Can be used individual, or used with solenoid valve or manipulator system.