[Mikendebbie]

I replaced mine a couple of months ago. When the "end of life" chirping starts - generally the thing will let you silence it "xx" number of times and finally it will go off and the silence button does not work. My RV was built November 2017 - so my five years was up. Mine is also hardwired. I could not find the exact "surface mounted" model that I had as OEM, but I found the same model "number" unit and I had to cut a small hole in the back of my kitchen island to get it to fit flush.

I thought I bought it on Amazon but I could not find it in my past orders...maybe I got it from Camping World or Rec Pro?? I think it was ~$75.