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  • Shimano has a switch sw-nx30
    Originally it was for front light, but you could as well use it for back-light.
    Has on-off setting but also auto setting that is ambient light activated.

  • Can't find it available anywhere, but that is generally a good idea.
    I just got another idea, as rear light is connected to the front one, can I just disconnect the cable between them when I don't need it?

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