a27 Equipped with an Intelligent Light Sensor: This bike light is equipped with an intelligent light sensor, which has been upgraded to automatically adjust the brightness of the bike light according to the environment. USB Rechargeable and 2200mAh Capacity Battery: The bicycle light is USB rechargeable and has three battery indicator lights above the switch. You can see the remaining battery level. Note: When charging, please use a compatible charging device. Easy Installation and Waterproof IPX65: Comes with a bicycle seat clamp and can be easily removed from the handlebar holder, and can also be used as a light when removed. It can easily handle bad weather such as heavy rain. 4 Lighting Modes: There are 4 lighting modes: Light Sensor Mode -> Strong Light -> Weak Light -> Strobe (10Hz). *Due to imported goods, there may be small scratches or slight dirt during the manufacturing process. Please understand.