Bests & Worsts Reviews from Amazon

Great Idea. I bought them 2/18/2017. Arrived 2/19/2017. They a very concealable. Seem to work with using test button. I removed one star due to only two mounting screw kits for three units. Also if you do a little research you will see that smoke detector sensors deteriorate over time. Most manufacture date (NOT THE DATE OF PURCHASE) time frames are 8-10 years to replace. Even if they have never been set off. That being the case I removed 3 stars would have been 4 if i could. They are selling very old stock. If it was reveled in the description and a bigger savings for the lost years, yes years, I would have been OK with buying them. The date code on these are 12/26/2013. So now I have to replace them in 5-7 years.