I just ordered online, 6 First Alert combo detectors. Ours are 10 years in age so I thought best to replace. I went with the original installed version since the model #'s matched and connectors looked the same. There are two listed under the name of First Alert. The other is BRK. Since Google is your friend, I find BRK is the contractor division of First Alert. The other is the retail version. Cost was around $28 each plus tax and shipping. Looking at lithium batteries instead of what is being pushed now. Reading the advertisement on the package it states 10 years of life, well look closer and it reads 10 years of shelf life. I plan on putting new or newer batteries in when I get the new detectors anyway.
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