UPDATED RUNNING LIGHT: 90-250 lumens of super brightness: High intensity light within 20 meters area illumination distance to ensure you can see potential obstacles or hazards; red taillight with warning triangle for better visibility from oncoming traffic drivers3 Light Modes With Rechargeable Micro-USB: High beam,low beam, and flashing;synchronous function for headlight and taillight; USB charging only 5 hours, can be used at least 3-5 hours. Please charge every 6 months if you don't use it for a long timePERFECT PRESENT: Christmas present or Xmas stocking filler for running lovers. Great birthday gift for men, women or kidsAdjustable Strap With Elastic Chest Band: This running light with flexible strap and adjustable length for comfortable wearing. Fully adjustable fit for runners large and small, just like the straps on a headlamp, you can tighten and loosen the straps to fit your needsBest Substitute For Headlamp And Flashlight: You'll Forget You're Wearing It - It is so comfortable compared to a headlamp that you might just forget you're wearing anything at all; It keeps your hands free (no holding a flashlight any more). Your satisfaction would be our priority. Any problem please feel free to conatct us.