30 Gram Running ArmbandThe reflective running gear is made of flexible Nylon, lightweight and easy to wear, even if you wear it for a long time, it will not bring you any burden, suitable for runners of all ages.USB Rechargeable Sport ArmbandThis Running Arm Band only needs to be charged for 2 hours, and it can be used for 3-5 hours of work, and working time after charging for 20 minutes about 2 hours, it can be charged multiple times to use. It takes LIR2032 rechargeable battery, long battery life up to 60-80 hours.3 Light ModesLED Armband designed with three flashing modes (long bright, fast flashing, slow flashing), it's controlled by switch, which can provide a super high field of view in the dusk and night activities. Outdoor sports at night, such as running, jogging, biking and hiking, provide more safety guarantee for your night travel.Adjustable Running Armband LightThe armband with a total length of about 35cm(13.65inch), it can be adjusted according to the size of your own arm, which can meet the needs of most users, it's very practical.Best Gift for JoggingIt can be applied to outdoor sports, night running, large-scale festivals, concerts, promotions, cheering, employee benefits, company large-scale activities, etc. to create different lighting effects for you.