A thermal sensor that is durable stable and accurate up to 300 yards * The built-in red laser and infrared lasers help pinpoint heat sources at night * False readings are eliminated with the 64 different sensitivity settings * The HeatSeeker works by detecting heat sources and motion of heat to help find game or humans * Temperatures are read as infrared lightwaves which appear on the digital bar graph display and are pinpointed by the built-in red laser and infrared laser