Maximise your visibilitywith a maximum of 500 led lumens and improved eye-catching warning flashing mode, tr500 maximises the ride's daytime visibility to a new level. The light comes with an intelligent brake sensor for urban riding and auto-on-off function for a convenient operation. There are also 5 other modes, 3 constant and 2 flashing for various riding environments. It is easy to use with the usb-c charging port and compatible with round and aero seatposts.Daytime & night visible: warning flashing mode with eye-catching flashing pattern and a maximum of 500 led lumens to maximise your daytime visibility. Built-in motion sensor for brake detection & auto on-off function: when activated, the light will switch to 200 lumens output for 2 seconds to increase your visibility when detecting braking. The light will switch off automatically after staying still for 2 minutes and turn on with vibration.Internal side strips for brighter side visibility: providing brighter side visibility with the internal strips, reflecting the light.Usb-c charging port: reversible connector to charge the light easily and with no need to flip around looking for the correct orientation.Compatible with round & aero seatpoststwo pads and rubber bands in different sizes and length for various sizes of round and aero seatpost solid and lightweight anodized aluminium body.Specificationsled: 3 x red ledsbattery: 1600mah 3.7V rechargeable li-ion batterydimensions: 41 x 33 x 62mmweight: 77g