Waterproof the speaker plug hole when they are removed
Supply a USB style rubber plug for disconnecting the speaker wires. I use my own earphones as many do and that leaves the speaker plug hole uncovered. I also own an SM10 unit and the rubber plug that covers its USB hole could also cover the same hole on the 20S. I doubt that would cost you guys more than 25 cents to include for the 20S.
A couple of pictures of the plug I am talking about are attached.
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