Fire Alarm Control System, Gas Detector, Stand Alone Smoke Detector manufacturer / supplier in China, offering Industrial 4-Wire Smoke Detector with Relay Output DC12-24V Operating Voltage Plug-and-Play Fire Alarm Installation, DC12-24V Rated 4-Wire Loop-Powered Industrial Smoke Sensor with DIN-Rail Mounting System and D105mm, Commercial-Grade 254-Point Addressable Fire Panel - Wall-Mounted Solution for Advanced Smoke Detection Systems and so on.