Press the black button beside the headlamp you can get four different mode: 3 LED bulbs, 7 LED bulbs, 19 LED bulbs and 19 LED flashing. Water resistant, shockproof, and erode prevent design, be your great assistant to cope with bad outdoors environment. Battery: three AAA batteries (not included). Durable, wearing comfortable on your head, workable in rainy days. Guide your direction in the darkness. High intensity 19 LED bulbs. A necessary tool for you to carry about, good for camping, night fishing and hiking. 4 different operation mode. Luminescence ultra-bright LED, soft, no flicker and lowest power-consumption. Adjustable strap, adjustable inclination. High tech, ultra-bright LED, operation life up to 100,000 hours, never need replacement.