Feature: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.Specification: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 and LED fiber and ElectronicsColor: Blue or Green or Red (optional)Battery: 3.7V 80mAhSize: 37 x 2.5cm or 14.6 x 1inWeight: 34g or 1.2ozPackage List:1 x LED ArmbandPackage List:1 x LED Armband