detect CO with joint exhaust fanwired networking functions(NO,NC).wireless networking: 315MHZ/433MHZ (2262 OR 1527).1、Electrochemistry sensor2、Power:110VAC/220VAC/230VAC 、9V-20VDC 3、Alarm density: Carbon monoxide:EN50291OR UL20344、Interconnecting Gas detector (1)Circuit for normally closed rely contacts (2) Circuit for normally opened rely contacts(3)Operating Frequency: 433 MHZ/315MHZ (optional)5、Size:158mm*94mm*46mm6、Weight:300g/pcs 7、Package size:65cm*46cm*39cm8、Quantity/Box:100pcs9、CtnWei(kg):35kg10、Q`CTY/20`FT:27000pcs