Specifications:Optical performanceMagnification (3.6-10.8) X31Digital zoom max 3XViewing angle 9.2°Objective lens aperture 31mmExit pupil distance 30mmF# is used for objective lens 1.3Infrared zoom max 2X5m-∞during the day; up to 300M at night (monochrome) Video output640x360 resolution TFT-LCDOSD ..