Ordered for some prototyping needs, we often start with a PC dongle like this then move to the needed target once we have the peripheral device more or less working. In this case we needed SPI and I2C ports for a project. The three board in electrostatic packaging came quickly, but no documentation at all. Nada. One comes to expect some sort of basic eye candy driver demo, or at least a link to one along with documentation. It plugs into Win7 and loads a driver without issues. One can seek for the chip (CH341A) or other names for the board (try "All in one SPI") of what seems to be its official name (YSUMA01-341A) but in any event you are on you own. And often the data sheets are in Chinese. For our needs without documentation, it is a loss and we will use more costly boards like what Silicon Labs provides. If anyone find some drive documentations or creates simple C fragments to get at it, please post a link for the rest of us.