Bookman Light is a bike light. Easy to attach and detach. Attach front light on the handlebar and tail light on the seat post.

Package content:
1 front light (white LED) and 1 tail light (red LED).
3 modes: 
Slow flashing, fast flashing and steady light. 
2 x CR2032 in each light body. To change the batteries, loosen the screws on the bottom.