ceiling CO detector Description: 1、Electrochemistry sensor 2、Power：9v Battery or12V-25VDC 3、Working temperature： -40degree~80 degree 4、Alarm density：Carbon monoxide：150ppm+-30% 5、Interconnecting Gas detector (1)Circuit for normally closed rely contacts (2) Circuit for normally opened rely contacts (3)Operating Frequency： 433 MHZ/315MHZ (optional) 6、Size：125mm*30mm 7、Weight:228g/pcs 8、Package size：58.5cm*42.5cm*30.6cm 9、Quantity/Box：80pcs 10、CtnWei（kg）：24kg 11、Q`CTY/20`FT：339200pcs 12...... Welcome to China and visiting our factory! Joy Yiliu