Add smart relay to your existing brake light or to additional brake light
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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 Brake Smarter Bluetooth relay 

Brake Smarter Bluetooth relay is controlled by your smart phone. 
Upon engine braking, you phone sensing slowing down and (automatically) activates the brake light.
Your MC is now visible upon engine braking.

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