INTELLIGENT LIGHT DIMMING: Bike lights are built-in optical sensor can automatically adjust the brightness according to the brightness of the surroundings. The light will automatically darken under strong light environment, and automatically brighten in low light environment to save power.USB RECHARGEABLE BIKE LIGHTS: Stop wasting your money on batteries again. Lights are usb rechargeable, convenient ensures and longer battery life. Lightweight bicycle lights fit in your pocket or your bag for easy transport.POWER INDICATOR: Rechargeable bicycle lights with 4-grid power indicator, allows you easily to know the remaining power and ensure timely charging.LIGHT MODE OPTIONS: Smart sensor light - High light - Low light - Flash - SOS, A simple and easy to use bicycle light. You only need to change the light mode by pressing the power button.EASY TO FIT LIGHTWEIGHT: The bike light set can be easily installed and released without any tools.The light weight and sturdy shell guarantees stable performance, which is very important when you ride on complex terrain.