Hmmmm, on the second look it seems that underlying LCD is actually LK204-7T which kind of makes sense from the model name, but it has no buzzer. Apparently product description does not match detailed specifications here: https://www.matrixorbital.com/elk204-7t ... =ELK204-7T

Hello everyone We recently got ELK204-7T unit and it works great both under Windows 10 and Linux. For Windows extra drivers were needed, for Linux out-of-the-box kernel support is available (as pretty much with any FTDI-based virtual USB-to-serial). Unfortunately, the device was shipped with firmwar...