Gentex Corp.
GN 503FF
Gentex Corporation has released a combination photoelectric smoke and carbon monoxide (CO) alarm with two sets of Form A/Form C relay contacts activating independently for smoke and CO events. The GN-503FF utilizes photoelectric and electrochemical sensing technology performance wherever smoke and CO detection is required. The GN-503FF is a 120VAC, hard wired alarm with 9VDC battery back-up and includes tandem interconnect capabilities, differentiating signals for each alarm type annunciation, quick disconnect wire harness, low or missing battery indicator and push button self and functionality test.
http://www.gentex.com/fire/products