Product Description: (AK-200FC/D) 1,Hot wire type sensor 2,Power:110VAC/220VAC/230VAC,12V-25VDC 3,Working temperature:-10degree~60 degree 4,Alarm density: Coal gas:1000~5000ppm, Liquid petroleum gas:1000~10000ppm, natural gas: 1000ppm~5000ppm 5,Interconnecting Gas detector (1)Circuit for normally closed relay contacts (2) Circuit for normally opened relay contacts 6,Size:86mm*86mm*60mm 7,Weight:200g/pc 8,Package size:48.5cm*48.5cm*26.5cm 9,Quantity/Box:100pcs 10,CtnWei(kg):17.82kg 11,Q`CTY/20`FT:55000pcs