ADJUSTABLE STRAP WITH ELASTIC CHEST BAND: This running chest 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 needs. WITH 3 LIGHTING MODES: High, Low and Strobe lights provide flexibility and the potential to extend battery time. Press red button that can achieve three switching modes. The behind triangular warning red light may help drivers to see you and avoid occurrence of incident. LATEST RECHARGEABLE BATTERY: Using the latest rechargeable battery. The package will come with a USB charger cable, then you can use it to charge in any USB port. It will be fully charged in 3 hours and using time is more than 5 hours in low mode. 90 DEGREE ADJUSTABLE BEAM ANGLE: The old run light only can bright the ground in front of you. Our running light is 90 DEGREE ADJUSTABLE ANGLE to meet runners' requirements for upward and downward slopes. MORE SAFETY: super brightness - High intensity light within 25 meters area illumination distance to ensure you can see potential obstacles or hazards; the USB rechargeable light is waterproof for outdoor use, practical, reliable, durable.