GD-768 stand-alone detector series meet UL1484 and EN50194 standard. The gas sensor is made of figaro gas sensor. The microprocessor based detector and figaro gas sensor ensure a continuous and precise monitoring. Features: 1) Figaro gas sensor 2) GD768-L detector liquefied petroleum gas (propane), GD768-N detect natural gas (methane) 3) Uses microprocessor for circuit control and gas monitoring to assure performance stability and reliability 4) Sounds alert with 85dB at 10 feet 5) Test button to verify operation 6) Five-year limited warranty 7) Complies with EN 50294 standard 8) 12V DC, 24V DC, 110V AC or 220V AC available, battery backup available 9) 10% LEL 10) Interconnect or relay or valve output available Packing: Boxes