With 4 LEDs youll be able to see virtually every crack in the road when the sun goes down. Alternative setting sends out a blinking red light to let oncoming traffic know youre there. 3 modes: 4 constant white LEd, 1 constant red LEd, or 1 flashing red LEd Lightweight design fits comfortably on your head. A must have for early morning training, racing and transition set ups. Tough Metallic ABS housing. Requires three AAA batteries, not included.