Questions and Answers

What does the USB socket on the rear of R4 Mk3 do?

This answer applies to R4 Mk3

The USB socket on the rear of R4 serves as a USB playback port, so you can load a USB memory stick or portable hard-drive with music to provide hours of uninterrupted listening. It also acts as a charge port so users can conveniently charge most Android and Apple phones.

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