Topeak's RedLite Mega is up to 20 times brighter than standard LED lights. What does that mean for you? Better visibility and peace of mind. This ultra-bright light uses a high-flux red LED as well as 2 red and 2 yellow LEDs that gets you noticed with 280-degrees of visibility and from up to a mile away! The Mega's AAA batteries (included) offer up to 100 hours of run time with several different modes. It mounts easily to seatposts and seat bags too.