1. USB Direct Charging The red light is on when charging, and the green light turns on automatically when fully charged. After a full charge, the lighting duration is 10 hours, with only 2 hours of charging required. The LED lightup running vest is USB rechargeable and has a long lifespan. 2. Adjustable Design The LED Running Vest features an adjustable waist belt with a circumference range of 33.5 39 inches (85 100 cm) and a waisttoshoulder length of 16.9 inches (43 cm). It fits for men, women, and kids, offering a universal size. 3. Enhanced Water Resistance The reflective LED Running Vest includes a thick waterproof ring for circuit protection. With reflective stripes, it ensures visibility at night for safety. Its lifegrade waterproofing allows use even on rainy days. 4. Large Pocket Lightweight The LED Reflective Vest has a spacious front zip pocket for storing a cell phone, keys, cards, etc. It feels weightless on the body and can be easily worn over a tshirt, winter coat, or any clothing.