Cateye Nima 2 Rear Bike Light Features 2 wide light beams and four modes: Constant, Flashing, Rapid and Pulse The heavy-duty rubber band is integrated with the light and can be attached to a handlebar, helmet, or bag 2 CR2032 batteries included Runtime: Constant: approx 15 hours Flashing: approx 80 hours Rapid: approx 70 hours Pulse: approx 70 hours Constant: approx 15 hours