I typed a long detailed review but the AE review system will only crash, so enjoy that instead.
If you have a basic use and intend to use only the provided software, go with this product (RU5600). If you intend to develop with it or send serial command, go with the more expensive RU5102 from the same seller, which as a way nicer commands set and better performance.
Criminals, in the description that the device can write, in reality important write commands were blocked, the device is absolute scrap, no purchase recommendation, poor support