Model: AK-200FC/C2 Sensors: Electrochemical Inspection gas: Carbon monoxide Working volt: AC220V/AC110V DC12V-DC20V(backup batteries 3 AA alkaline batteries or Rechargeable battery pack) Assorted function: Synchronous fans Wireless net:315MHZ(2262or1527). Patent NO:200830103203.9 1, Working temperature: -40degree~80 degree 2, Alarm density: Density(PPM) 50 100 300 400 Reaction time ( minutes) 60-9010-40Less than 3immediately 3, Interconnecting 1, circuit for normally closed relay contacts 2, circuit for normally open relay contacts 3, Operating Frequency: 433 MHZ/315MHZ (optional). 4, Size: 163mm*87mm*40mm 5, Weight: 400g/pcs 6, Package size: 65cm*46cm*39cm 7, Quantity/BOX: 100pcs 8, Weight/carton : 45kg. .