Product descriptionú¦ 1íóPOWERú¦110VAC/220VAC/230VAC ( or 9V batteries or Rechargeable bettery patck) 2íóWorking temperatureú¦-40degree~80 degree 3íóAlarm density: Carbon monoxideú¦EN-55022,EN-55024 4íóINTERCONNECTING GAS DETECTOR (1)CIRCUIT FOR NORMALLY CLOSED RELY CONTACTS (2)CIRCUIT FOR NORMALLY OPEN RELY CONTACTS (3)Operating Frequency: 433 MHZ/315MHZ (optional) 5íóSIZEú¦163mm*87mm*40mm 6íóWeight:400g/pcs 7íóPACKAGE sizeú¦65cmX46CmX39cm 8íóQuantity/BOXú¦100pcs 9íóCtnWeiú¿kgú¬ú¦45kg 10íóQ`CTY/20`FTú¦27000pcs