Use as a headlamp (using the headstrap) or a cap light (using the hat clip) Up to 30 lumens brightness. Up to 50 hours run time (2) Nichia® white LEDs for distance (1) green LED for stealth, safety and night vision Rugged polymer construction with Silent Hinge™ Ultralight: only 0.9 oz including batteries and headstrap Operating temperature 14F to 140F Knife features a locking liner for safety 2” stainless steel blade holds a sharp edge Rugged aluminum handles with rubber grips