1、LED armband ensures good visibility to keep you safe at night. 2、3 lighting modes switchable: Constant, Fast flash, Slow flash. 3、Built-in battery is rechargeable from any device with a USB port. 4、Adjustable band provides a customized fit for different people. 5、Waterproof conservation for the charging port, no worry about rainy days. 6、Suitable for running, jogging, Cycle, hiking, walking, and other outdoor activities. Features: LED armband ensures good visibility to keep you safe at night. 3 lighting modes switchable: Constant, Fast flash, Slow flash. Built-in battery is rechargeable from any device with a USB port. Adjustable band provides a customized fit for different people. Waterproof conservation for the charging port, no worry about rainy days. Suitable for running, jogging, Cycle, hiking, walking, and other outdoor activities. Specifications: Material: Nylon + LED fiber + Electronics Color: Blue / Green / Red (optional) Battery: 3.7V 80mAh Size: 37 * 2.5cm / 14.6 * 1in Weight: 34g / 1.2oz Package List: 1 * LED Armband 1 * LED Armband 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.