BURRIS NIGHT VISION THERMAL DEVICE FOR NIGHT HUNTING.The Burris Thermal Scopes are packed with features that will help you take night hunting to a whole new level! Offering 4 power zoom, hot track, stadiametric ranging and 5 unique color palettes.The calibration mode can be used to correct image and remove abnormalities. Before performing scene calibration, make sure that the lens cover is closed, or the lens is evenly aligned.There are four zoom-in modes: 1x/2x/4x and Picture-In-Picture (PIP).When the menu bar is not displayed, rotate the Roller Button up or down to switch zoom power modes. The reticle line is synchronized with the zoom levels.The scope can be set to display infrared images in a variety of colors making it easier for users to observe and identify targets.There are ten levels (1-10) of image brightness that can be adjusted to user preference.There also are ten levels (1-10) of image contrast that can be adjusted to user preference.When the thermal scope will be not used for a long time, store the it in a dry, well-ventilated environment and charge it at least four hours every 2 months during the storage.