Bicycle Smart Rear Light, Brake Activated Rear Light, Auto On/Off, All Aluminum,, USB Rechargeable, Cycling Safe Accessories: Features: 【INTELLIGENT BRAKE SENSOR & EASY TO INSTALL】- Automatically switches to high-brightness mode when braking, super-bright 5-second lights rear drivers to improve your . You can use a metal bracket to mount it under your saddle, or use an adjust silicone strap to secure it to your seat post. (We offer 2 bracket installation ) 【Four Light Modes and High Light Efficiency LED】- There are 4 light modes for you to choose, enjoy your ride the way you want, the high COB LED bicycle tail light makes you more visible, it is perfect for night riding Bicycle Light. 【Automatic to Save Battery】-Bike rear light with motion sensor and light sensor, it will automatically turn off if no motion is detected 30 seconds. Even if you drive in the sun, the taillight will turn off automatically because the light sensor is working. If you want to drive in the daytime and the taillight needs to work all the time, please select mode 3 and mode 4 to avoid the strong light sensor. [Brightness and Battery Display] The brightness of this bicycle taillight is adjust. In stable on mode, just press and hold the button to get the brightness you need. It has a built-in 400mAh lithium- battery and can last for 50 hours of use (will (Affected by the brightness you set) Run time full charge. Four blue indicator lights, each showing 25% capacity, no more forgetting to charge. 【Aluminum Housing & IPX6 Waterproof】-This bicycle taillight is made of aluminum alloy housing, which feels beautiful and looks great. Waterproof/dustproof, shockproof, suitable for any harsh working environment. Product Description: Package includes：1 tail light + 1 USB cable + 1 metal bracket + instruction manual Lamp:Smart Brake Light USB Charging Tail Light Sitting Bow Version Perfect Decoration and Gift:Classic and stylish home lamp design will be great home decorations.Perfect gift for your family or friends on celebratory days such as birthdays and important holidays Safety:In terms of product quality,we have been restraining every production process with a high standard system to ensure that every lamp meets the quality and standards Beautiful and Practical Decoration:When it is off,it can be a very beautiful piece of home decoration.When you light up the bulb, the bulb will a dazzling light,creating a beautiful for your home!It is a great decoration Buy with Confidence:We adhere to the strictest quality control procedures.If you have any questions,please let us know directly and we will be happy to help you