USB rechargeable: running lights does not need to replace the battery. Remove the cover at the clip, the exposed USB plug chip can adapt to most USB interfaces. When inserting the interface, the red light indicates that it is charging. If it is fully charged, the green light will be on. Reminder: please pay attention to the direction when inserting. When inserting the interface, adjust to the correct insertion mode that the product can light up Safety design: the reflective usb rechargeable running light is bright enough to light up yourself and the road around you while you jog at night, so that others can see you from hundreds of meters away, reducing the frequency of accidents and making it easier to exercise outdoors at night Reliable and serviceable: our outdoor night running gear is made of quality ABS plastic, light in weight and compact in size, can run for about 3-4 hours on a full charge, suitable for most weather and seasons. Widely applied: the reflective USB rechargeable running light can be clipped on hats, belts, collars, pockets, backpacks, dog collars, etc., so you don't have to hold it in your hands, thus reducing the burden of running, jogging, climbing, camping, outdoor activities, practical to use Package Included: 1* Clip On Running Light Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store