In getting this type of doorbell, it is important to note that the higher the resolution it offers the clearer the footage that you get. High resolutions mean it ranges between 1600 x 1200 and 1920 x 1080. For the clearest picture, you should pick the one that offers a 1080 resolution. Aside from the resolution, it is also important that the device that you choose has a good field of view. A 180-degree FOV will enable you to see everything at the front door and to its sides. Do not get a model that offers a lower field of view because it will just leave you blind on some spots in your door.