Exceptionally Lightweight Design: Our running light is only 37g, which is extremely light. Whether you are speeding on city streets or galloping on trails, this running light can make you feel relaxed and free of burden, focusing on running and enjoying the journey. Powerful Lighting Technology: technology not only provides bright wide-angle lighting, but also consumes less power, allowing you to maintain longer battery life while running. Three Speed Light Adjustment: 1. white light, 2.red light, 3.red and white light flash alternately. These three carefully designed light modes are suitable for various scenes, whether it is traveling at night or seeking emergency help in unexpected situations, they can perfectly meet your needs. Waterproof and Sweat-Proof material: Our arm lights use PVA material on the part that straps to the arm, which is water and sweat resistant. It ensures that the light always works properly and protects the internal components from damage caused by sweat. Convenient Type - C Charging: Our running lights use a Type-C charging port, which only takes 1.5 hours to charge, which is very convenient. Whether you are at home, in the office or on the go, you can easily charge your running lights with any standard USB-C charger."