LUMEX ULTRA-LIGHT, ECO-MODE, FLIP-ON COLLIMATOR. ECO MODE: adequate luminous flux for a continuous operating time up to a couple of days.HIGH MODE (85 lm) up to 2 hours burn time. Wide-angle beam adjustable flip-on collimator lens for proximity vision. Water resistant: rain and splashes, snow and frosty weather. Only AA battery included: easy to source and cheap to buy and carry for replacement. Red emergency light. Ultra-light head lamp, combines the advantages of a highpower lamp (relatively limited autonomy) with the compact construction of an emergency lamp; 4 frontal lighting modes. ECO-MODE provides a sufficient luminous flux to carry out almost any foreseeable activity. You need to switch to high mode only when you want a focused beam to be precisely directed over a long distance, or when you want a very intensive luminous flux for lighting a wide area (wide beam). 1 AA ALKALINE BATTERY (1,5 V) INCLUDED. FLUX:85 Lm/2 hrs. 49 g