This was a replacement model. The prior model was great as well but we believe someone put glass in by accident. So instaling this really meant attaching to the existing hardware, a quick wire connection, and a plug in. I am not sure why they do not just have some sort of switch between a wired solution and a plug in option. This would allow people who are not comfortable with tying off a wire to just plug in, BUt other than that it has worked tremendously well since installation.