It fits perfect. It works when it's supposed to. And it's WAY cheaper than buying it from Comcast who was supposed to have supplied it anyway because I had a preexisting security system but when they coerced me into upgrading my modem they said the upgrade kit didn't include a backup battery (even though my old one did) but they would be happy to SELL me one for about six times more than from Rakuten. Good gosh amighty I hate Comcast.
Was this review helpful to you?YESNO