FEATURES: Total Darkness Tech: standard , Magnification: 4x, Intensifier Tube: High res. 1st Gen, Lens System: F1:1.7, F90mm, Diopter Adjustment: ±5, Resolution: 40 lp/mm, Power Supply: One 3 volt lithium, Range of focus: 20m to infinity, Controls: digital, Battery Life: 10-20 hours, Operating Temperature: -40°c to +40°c, Dimensions: 9.5" x 5" x 3.5", Weight: 3lbs. 2 year mfg warranty.