On or off, Cateye's Reflex lets you be seen out there. One super-bright LED and 4 small LEDs give you more than 180 degrees of visibility. It's got 5 different modes, so you can customize the pattern and run time.
2 AAA batteries are included.
Run times: Rapid: 40 hours; Long-life: 60 hours; Pulse: 40 hours; Flashing: 60 hours; Constant: 40 hours.