The Leupold Thermal Optic Quest is a powerful handheld thermal device, a camera, and a dual-mode, 300 lumen flashlight. With it, you can detect heat signatures out to 300 yards, which can make all the difference in scouting or tracking downed game.Thermal Sensor: 206 x 156. Operating Temperature: -4F to 140F. Temperature Detection Range: -40F to 872F. Fixed Focus. Startup Time: < 3 seconds . Detection Distance: 300 Yards . Battery: Internal - 4 Hours Continuous Use.