Be safe and be seen!
This light set is super pocket sized, with both front and rear lamps housing super-bright LEDs.
Flex-tight brackets are supplied, as are the batteries, so setting up this light set is very straight forward, and the lights can be removed quickly and easily and carried in your pocket when you are leaving the bike locked up somewhere. 

The front light lasts for 80 hours in constant mode from two AA batteries. 
The rear lasts 150 hours (flashing) from two AAA batteries.