The Leupold LTO Tracker 2 7x Handheld Thermal Viewer is designed to display heat signatures and blood trails in the field. The Beacon mode allows you to recalibrate with the temperature of your surroundings, so you continue to get the best image as you move. A manual gain control delivers easy setting customization for ideal visibility in a variety of surroundings, while the compact design and aluminum housing boast a light weight and durability. 6 color palettes.