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Review title: Kidde KN-COSM-IB replacement for older smoke alarms and CO detectors
Product review: The unit was purchased when I discovered that CO detectors have built in End-of-Life timers. Apparently the CO detector itself is only good for approximately seven (7) years after first activation. This is a combined ionization smoke alarm with CO detector and supplemental voice alert.I replaced my old Firex G-8's with two KN-COSM-IB's and one P12040 (new PE120). The new documentation in the boxes indicates that these two model Kidde alarms are inter-connectible and compatible.Unit testing has confirmed that they all work properly when hardwired.I have also read that even smoke alarms are now required to be replaced after 10 years of service.
