4GHz repeater. Besides the price, the main reason to get this video doorbell was that you do not need to use a paid service. The dr4awback is that you can only retrieve the current day's videos. The videos will be deleted the following day, unless you save them to your phone, or computer, tablet, etc. You can use the doorbell to answer your visitor's calls at the door, while having a 720p Video of the person that is at the door, andusing 2 way audio. The video quality is excellent, and it does not distort too much due to the use of the fish eye lens, toprovide the wide angle. It is much better than the video on the Ring bell of a friend. Even though the RING bell is 1080p,and wider lens, but the distortion is much more noticeable. Installation was very easy, with the exception that my transformer only provides 10V, and it initially did not work. Itconnected and installed fine, the button light went to a steady blue, but as soon as I pressed the button, the led colorwould change to Green and the chime would "try" to sound but would cutoff immediately. I thought I needed to install theadapter that came with the unit, but when I checked the voltage on my transformer, it was 10VAC, and as I pressed thebutton, it would come down to about 9.