Clearwater Billie Jr Brake LightMust be used with CANopener. Must have CANopener version 1. 6 or higher. Full feature list available only on CANopener version 1. 82+. Why is the CANopener required? The Billie Brake Light is an "intelligent" brake light module that utilizes sensor data carried on the CAN bus. This allows the Billie to read how hard the bike is braking in order to react appropriately to any given situation. If you already have a Clearwater CANopener light kit
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