CYCLEAWARE HOTROD MTB HANDLEBAR LED

These little lights from Cycleaware mount in place of the endcaps of your handlebars.  When you want them, pull them out and turn them on.  When you don't, they slide back into your handlebars and out of the way.  Two white LEDs face the front and 3 LEDs face the rear, so you're visible from front and behind.  These can also be used as portable safety lights.