It is a safety light for running, walking or any other sports especially at dawn, dusk, night or rainy days. Or tail light for bike or bicycle; and can be a collar light for your pet, not only keep your dog or cat safe, but also make you identify them clearly from a long distance. When something happen, it can be an emergency light also. Features - ColorAssorted Color - Material: Plastic. - Size: 5.3x3.3x2cm. - Continuous lighting time: 48h. - Irradiation distance: 20m. - type: Long press. - Light source type: 4 - Slim, lightweight, compact, and with 48h continuous lighting time. - Safety light for running, walking or any other sports especially at dawn, dusk, night or rainy days. - Can be used them as your arm running light, dog walking light, rear light, safety lights - day or night. - Easy to operate, just long press to on. - A suitable irradiation distance(20m). Package list: 1 Safety Light