What are the two USB module product secrets that have been sold for 10 years?

What are the two USB module product secrets that have been sold for 10 years?

The answer is: professional, easy to use.

The so-called "professional" refers to the complete encapsulation of the USB protocol;

The so-called "ease of use" is that users do not need to know.

These two models of the Thai brand USB products are:

First, the serial disk module USB118AD

is the complex USB protocol into a simple serial port protocol, for details, please refer to:
Http://www.usbing.net/proshow52.html

Second, the Port USB module usb20d

is to turn the complex USB2.0 protocol into a simple parallel bus operation, please refer to:
Http://www.usbing.net/proshow53.html

What are the two USB module product secrets that have been sold for 10 years?