GoMotion Synergy Reflective Hydration LightVest, 100 Lumen CREE LED Lightweight hex mesh vest made for comfort and function; Adjustable chafe guard shoulder straps and sternum strap slider with comfort pads Powerful 100 Lumen CREE LED light powered by 3 AA Energizer batteries located in the external battery pack; Batteries included Customizable light modes, High/Medium/Low (20/24/50+ hours), for different light intensity and run times Vertically adjustable rotary dial on front light changes the light stream from narrow to wide; Light itself can pivot up and down in a range of 100-110 degrees Reflective strips and trim for added safety and a red LED light built into the back battery box which provides a flashing pattern for high visibility