Operates with a single CR123A or AA sized battery; 3 meter multiple orientation impact resistance tested; IPX7 Rated design; waterproof to 1 meter for 30 minutes. O-Ring and gasket sealed openings. Meets MIL-STD-810F, Method 512.4; Pull-to-turn locking rotary selector knob prevents accidental mode changes and allows selection of 4 illumination sources. See model for specific LED configuration; Tactile indicator on rotary knob for IR LED position; Push button switch enables/disables selected illumination source starting at low output and progressing to the brightest output in 4 discrete steps. Double click of push button initiates high output strobe of selected illumination source; Built in battery polarity protection guards against damage to the light; Cord attachment hole provided in clip capable of supporting 25lbs of load; Durable Belt/Clothing clip with integral helmet mount features