BLACKBURN 2'FER USB Front/Rear Light (2-Pack)

The clever mount design lets you easily pop it onto your bike's handlebar or seat post, or use the clip to mount it on your backpack or belt. With the push of a button, this light can switch between a white front light and a rear red light. Holding the button for 2 seconds turns the light on and off, and pushing the button once chances modes between white solid, red solid, white flashing and red flashing.