COP-USA PH35 Video Peephole Door Camera, 1/3" CCD Image Sensor, Horizontal Resolution 480 TVLines, Minimum Illumination 0.1 Lux, 1.7mm Super Wide Angle Lens, 1.0Vp-p 75 Ohms Video Output Adjustable to Multiple Standard doors width Best suited for a 2" to 2-3/8" thick door. Can marginally work on a 1-3/4" door using adjustment screws (but creates a 1/4" gap between door and camera) 13/16" hole (or counterbore) required for lens to mount flush If the lens is in direct sunlight (faces East to the outside and there's too much sun) the image is very poor. Nice color image when lens is not in direct sunlight