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 lighting conditions. Product Name: R0 Rear Light with Same Frequency Waterproof Rating: IPX6 Built-in Battery: 3.7V 250mAh Polymer Battery Battery Life: Approximately 6-40 hours Charging Input: 5V-2A USB Type-C Operating Temperature: -10°C to 60°C Operating Humidity: 80% Features: Same frequency synchronization, link mode, brake sensing, automatic sleep, vibration activation, 5 installation methods Color: Black Material: PC+ABS Package Contents: 2 x Handlebar Lights 1 x Charging Cable 1 x Wrench Note: Only the items listed above are included. Other accessories are not included. Note: Light reflection and differences in display screens may cause slight variations between the color of the item in the photo and the actual product. Measurement error allowance: +/- 1-3 cm.