3000LM XML T6 LED HeadTorch Zoomable Headlamp Headlight Green For 18650/AAA Suitable for most indoor like home maintenance and outdoor activities like camping, fishing, hiking, map reading, night fishing, night flying, sailing, caving and hunting etc. Internal wiring applies the high efficient booster circuit, working voltage is wide and can utilize the batteries in the largest extent Adjustable focus range for different usage Roll the ring on the head from left to right or from right to left to adjust focus