Cateye's Tight Kinetic Rear Brake Light is tough, highly waterproof and features a range of clever innovations designed to keep you safe.Waterproof design rated to IPX72x AAA batteries (included) provide long run time of up to 180 hours5 LEDs with 3 modes - 2 flashing, 1 lightingSimply switch between modes with one buttonFlexTight bracket is quick and easy to use on seatpost or seat staysTough and versatile, the Tight Kinetic uses 5 LEDs to help you remain seen out on the road and is breeze to use thanks to its single button operation and FlexTight bracket. Thanks to the included AAA batteries, the Tight Kinetic can run for up to 180 hours, while 3 modes give you a range of options to choose from. If you want a great value rear light, the Cateye Tight Kinetic Rear Brake Light is a great choice!