Battery Operated Protection for Your Family and Your Home. Protection on Every Level is a Must! Smoke alarms, carbon monoxide alarms and fire extinguishers should be located on every level of a home and smoke alarms should be installed inside every bedroom and every separate sleeping area. If hallways are 40 feet or more in length, smoke alarms should be located at each end. This alarm is for you if you want: basic protection from fire. 9 V Battery included Hinged cover for easy battery replacement Beeping signal warns when battery needs replacing 3 year limited warranty Questions?