High-stability sensor Independent and network optional Auto reset after alarm Power: 110, 220V AC, 230V AC, 9 to 20V DC Working temperature: -10 to 60-degrees Alarm density: Coal gas: 1,000 to 5,000ppm Liquid petroleum gas: 1,000 to 10,000ppm Natural gas: 1,000 to 5,000ppm Interconnecting gas detector Circuit for normally closed relay contacts Circuit for normally opened relay contacts Operating frequency: 43/315MHz (optional) Size: 115 x 71 x 43mm Weight: 228g/piece Packing size: 58.5 x 28.5 x 53.3cm Quantity/box: 100 pieces Carton weight: 28kg Carton/20-feet quantity: 35,200 pieces