Product Details: Material: Nylon The circumference of the entire armband: 35cm, width 2.5cm Blinking mode: long light, fast light, slow light (control by switch) Battery: CR2032 button battery Feature: Operates on a small button battery, and the LED lights and polymer for light transmission provide extremely high visibility during twilight and night activities. The brightness is much higher than the glow of the dark glow sticks. This means more safety for you, your children or your pet from careless and distracted drivers. Three lighting modes,The light strips have three lighting modes: fast flashing, slow flashing, always bright mode. Just one click to control. Easy to use, suitable for all your favorite outdoor sports, e.g. Biking, jogging, running, camping and walking. Freely adjustable size,suitable for most men, women and children. You can wear them on your wrist, ankle and arm. Quick to apply and very light, with good quality and comfortable material, the jogging light strips are the ideal complement to reflective things, perfect sport accessories. Powered by two pieces of CRV2032 lithium button cells, the led bracelet can work approximately 60-80 hours. Normal use for 2-3 months, battery can be replaced by yourself. We sell two editions: battery edition and charging edition, please pay attention to the distinction before ordering, thank you for your understanding! Notice: 1.Due to the light and screen differences, the item's color may be slightly different from the pictures. 2.Please allow slight dimension difference due to different manual measurement. Package included:1 x LED Bracelet