HIGH VISIBILITY & DOUIBLE PROTECTION: there are seven LED light at every shoulder strap which ensure your safety in the event a car hasn't turned on it's headlights with completely in the darkness; meanwhile, shoulder and waist strap have refelctive stripe provides fantastic visibility. USB RECHARGEABLE: just need the power source with USB port to charge for the LED vest, 6 hours running time; when charging, the LED light will lighted up and the light will automatically close after 3 hours full charging. ADJUSTABLE SIZE: each strap is made out of 2" wide elastic, shoulder strap can be adjustable 27 - 50 inch (69-127cm), the waist strap can be adjustable 14- 27 inch (35 - 69cm). COMFORTABLE & LIGHTWEIGHT: soft and light material for increased comfort, good-quality elastic strap and four adjustment buckles ensuring a perfect fit and freedom of movement, front access quick-clip design for easy on and off, quickly release. MULTIPURPOSE: great sports gear for running, walking, cycling, biking, motorcycle, jogging, dog walking, work on the construction site, traffic safety, etc. TAGVO LED Reflective Safety Vest with Storage Bag USB Charging LED Reflective Vest Night Light up Vest Adjustable Elastic Running Gear Reflector Straps for Sports Outdoor Cycling Walking Working - B2ZUZ0BJA