I had three DCS-6620's and all three broke down within 1 to 2 years. I took them apart and they all have the same problem. The small plastic motor gear that runs the focus wears out and the teeth brake off. The gear is plastic and looks like it cost 5 cents. The camera has auto focus so depending on your lighting condition the focus may run several times per day. And it is just a matter of time before this gear breaks. One camera broke after 1 year as the autofocus ran more where I had it and the 2nd/3rd broke down around 2 years. Once it breaks you can throw your $400 camera away as the picture is just blurred without focus. I recommend not buying a Dlink DCS-6620 if you need the camera to last more than 1 to 2 years!