Clearly Visible, Daytime and Night - With 3 high lumen CREE XP-E2 red LEDs, TR300 provides larger viewing angle and max 300 LED lumens on flashing modes to keep the rider clearly visible in both daytime and night riding. The light also comes with an optional Auto on-off function under which the light will turn on automatically when sensing a motion and switch off after staying still for 2 mins. Key Features: Flashing modes with max 300 LED lumens, providing great visibility for daytime riding,Internal side reflecting stripes, enhancing the side visibility and increasing the rider’s safety,Auto on-off mode for convenient use,Solid and lightweight anodized aluminum body,Compatible with round and aero seatposts,Micro USB charging port, compatible with most phone chargers,Intelligent memory circuit remembers the last used brightness level and mode when turned on again,.Specifications: LED: 3*CREE XP-E2 red LED,Battery: 1600mAh/3.7V rechargeable Li-ion battery,Dimensions (light unit): 41mm (L)*33mm (W)*62mm (H),Weight (light unit): 77g,Design and specifications are subject to change without notice..