they don t know what it means. that s another thing to tell you about today. what do the chirps mean one chirp means it s probably not working. cleaned or replace the battery. two chirps mean it s failing. definitely time to replace it. three chirps means there is smoke and four carbon monoxide. will: no idea. need to know that on the back of every unit manufacturer indicate. don t wait. go today. take your units down. take a look. a lot of people have no idea when they were installed. 10 years or less is good. 10 years they have got to go. these are guaranteed for 10 years. combination smoke different rooms. every sleeping space. outside the sleeping rooms in the kitchen, the garage. rachel: why is it different than in a bedroom or a hallway? they are interconnected a lot of the new ones in interconnect. they will tell you where the fire is there is a fire in the basement. it s going to say there is a fire go off in every room that s really helpful. even have lights on them now li
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