Ultraspire - Lumen Ultraviz Lighted Waistpack The Lumens light has a focused center with wide-angle peripheral light for a natural running experience 180 directional rotation with a range of motion adjusting 90 up and 90 down and anywhere in between for the best depth of field over the road or trail ahead Easy operation of light: Push button once for On which is also the High setting. Press again sequentially for Medium, Low, S.O.S., and Off. Button pressed after 4 seconds will go straight to Off Adjustable sizing from 26 to 42 170 Lumens. Uses 3 AAA batteries (not included)