I purchased two of these. I nor a computer technician were able to get them to function. They were hard wired and nothing that we tried would get them to be recognized. To make matters worse, when we called for tech support, we were speaking to a foreign country who clearly new nothing about the system and she was reading a scripted repair procedure. I ultimately removed the cameras and the doorbell as it had issues as well. Very upset about spending good money and not having them function properly!!!!!!!!