about this project LED Bike Tail Light: Choose different lighting modes to protect your riding safety. The Daytime Strobe is super bright, making you more visible to other road users. The smart bike brake light turns on automatically when slowing down or stopping. Anti-theft Bike Siren with Remote Control: The high-decibel sensitive horn will make a loud sound when it detects any movement or vibration, effectively preventing your bike from being stolen. Auto On/Off LED Bike Rear Light: In flashing or daytime strobe mode, the headlight is motion triggered. The bike tail light turns on automatically when any motion is detected. The bike light turns off when the bike is stationary for more than 30 seconds. Smart Light Sensing Saves Your Time: Built-in smart light sensor, the bike tail light automatically turns on in low brightness and turns off in high intensity light, saving you time switching rear bike lights. EASY TO USE & WATERPROOF: Saddle and Seatpost mounts make the tail lights fit different bikes. Excellent IPX5 waterproof bike backlight can be used in rainy days. The safe USB rechargeable lithium polymer battery gives the light a battery life of up to 40 hours.