Engine braking Brake Light

Engine braking is a powerful and important technique that all bike riders use.
The trouble with engine braking is that it does not illuminate the brake light.

Problem Solved with Hands-Free Rear Light

Hands-Free Rear Light is controlled by your smartphone.
Upon engine braking, Hands-Free Rear Light senses slowing down and (automatically) activates the brake light.
Your bike is now visible upon engine braking.