This dome camera has a Sony Super HAD CCD chip which makes it extremely sensitive to light and perfect for low-light conditions. Built into this dome camera is an auto iris lens which automatically adusts to changes in light so you get a better image. Manual zoom controls are accessed by removing the dome cover and adjusting the zoom. Dip switch controls (on the back of the camera AES, AI, AGC, AWB, BIC, FL) allow you to change various image settings. Dome is 4” in diameter.