Enjoy automatic safety with the CatEye Jido HL-AU230 Bicycle Headlight. Five 5mm white LEDs turn on automatically whenever darkness and motion are detected and will stay on for 40 seconds after you've stopped riding. Easily choose between auto and manual mode for additional safety options. 4 AA batteries power the Jido for up to 60 hours in flashing mode. Constant mode provides 30 hours of runtime and a low battery indicator warns you when it’s time to replace your batteries.