CatEye TL-AU165 W/SP-5
CatEye Auto Technology in a small visible package
The TL-AU165 automatically turns on and starts flashing when darkness and motion are detected by the motion and light sensors (light turns off automatically when you stop your ride). The stay on function continues flashing while you're paused while riding to ensure safety during traffic stops.Even if the battery runs out, the reflector continues to ensure rear visibility. The TL-AU165 runs for 6 months with out replacing the battery (when used for 30 minutes a day).