Kidde KN-COSM-B Battery-Operated Combination Carbon Monoxide and Smoke Alarm with Talking Alarm.  The great thing about this alarm is it will announce the hazard type that detected.  With the battery safeguard it will ensure that the alarm cannot be installed without batteries in it. It also meets the  requirements of Underwriters Laboratories (UL), an independent facility that tests products for safety compliance.

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