Instruct: Classify Amazon reviews into positive or negative sentiment
Query: BRK stands for BROKEN!!!

What a piece of junk. We put an addition onto our house and our contractor installed about 10 of these to get our house to code. Within a year, I have yanked all 10 down because they keep chirping. And I swear, it's ALWAYS in the middle of the night. I think the battery contacts begin to separate away from the contacts of the battery over time. You can pull them back, but the fix doesn't last long.Anyway, don't waste your money on these things.