The Cateye 1100 is the best battery taillight available anywhere, and has been for umpteen years; I'm surprised that no one makes a cheaper copy. I use it as a daylight blinkie (in addition to the BUMM Toplight Line driven by the dynamo) but it has a steady mode as well as several blinking modes and two levels of brightness. It's smart to keep a tiewrap across it lengthwise, between the bubbles, because two of mine had to be replaced when the cap popped off on the road and could not be found. As Jags says, a much-recommended lamp; you won't regret spending the money.
