Enhanced Visibility and Safety: Equip your bicycle with handlebar lights featuring an intelligent brake sensor that automatically adjusts brightness, ensuring high visibility and safety during night rides. Waterproof Design: With an IPX6 waterproof rating, these bike lights are built to withstand adverse weather conditions, making them ideal for outdoor cycling adventures. Versatile Lighting Modes: Choose from 5 different lighting modes to suit your environment and battery life needs, enhancing flexibility and usability in various conditions. Product Name: R0 Rear Light with Synchronization Function Waterproof Rating: IPX6 Built-in Battery: 3.7V 250mAh Polymer Lithium Battery Battery Life: Approximately 6 to 40 hours Charging Input: 5V/2A USB Type-C Operating Temperature: -10C to 60C Operating Humidity: Up to 80% Features: Synchronization mode, brake sensing, automatic sleep, vibration activation, 5 installation options Color: Black Material: PC + ABS Package Contents: 2 x Handlebar Lights 1 x Charging Cable 1 x Wrench Note: The package includes only the items listed above. Other accessories are not included. Note: Lighting effects and display differences may cause slight variations between the color shown in the image and the actual product. Measurement error allowed is +/- 1-3 cm.