I make this 10 LED Third Brake Light that operates on 6 or 12 Volts. The light has been designed to flash to get the attention of following drivers, and then after a few seconds it goes to a steady on. The lights also use a dc plug and jack to make them easily attachable and removable.
This light is intended to be mounted on the inside of the rear window.
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If you desire to have a light that mounts externally, I make this light as well:
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Please let me know if you have any questions.
Thanks,
EJ