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The WiFi must be 2.4 Ghz
The SSID name MUST NOT have a ' or a - in it. It might not even work if the SSID has anything other than lower case letters only and/or no more than one word.
If you have a battery working properly and you want to change its WiFi connection, I found that trying to change the connection for the previous instance does not work. Delete that device in the smartphone app and add a new one. Then it works fine.
I'd say the Roost people have a pretty poor engineering team to NOT have anticipated different spellings of the SSID and the support/documentation people for having not updated their troubleshooting instructions with what you see in the 4th paragraph above which I discovered with them in Dec 2015 and as of this writing in April, 2016 it has not been updated.
I think the product is a great idea to be able to early detect smoke before the flames are coming out the roof. Pretty good insurance for $32 covering the length of the battery of say 5 years.
BUT if they don't up their game in engineering and in support documentation, they will be overcome by an competition that does.
