Be seen, be safe! This little light has both a flashing and a steady mode. It's weatherproof, lightweight and durable. Bike mount and clip mount is included for a variety of ways to attach it to you or your bike. 2 - AAA batteries come with the light and will provide up to 100 hours of run time. 2-5/8 inches high, 1-1/4 inches deep, 1-1/8 inches wide.