This premium quality waterproof tail light features 10 LEDs, 6 facing straight back and 2 facing sideways on each side.
This is probably the brightest 2-AA cell blinky there is, thanks to CatEye's superior optics.
The LEDs are arranged in two banks of 5, with separate switches for the upper/lower banks. Each set of 5 LEDs can be independently set for either steady glow or one of three different flashing patterns for maximum conspicuity.
Comes with a quick-release seatpost mount, also fits standard reflector brackets with included hardware. 2 AA Batteries included.