(4) First Alert BRK Alarm, (3 SMI100-AC Smoke, 1 SMICO100-AC Smoke/C. Monoxid)
(1) First Alert BRK SMICO100-AC Interconnect Hardwire Combination Smoke & Carbon Monoxid. (3) First Alert BRK SMI100-AC Hard Wired Battery Back Up Smoke Detector. (4) First Alert BRK Alarm, (3) SMI100-AC Smoke, (1) SMICO100-AC Smoke/C.