In fact, the device is built on Realtek 8811cu (USB vendor:product 0bda:c811), not 8811au, and this makes it of less use for me, because its linux driver doesn't fully support monitor mode. But it works well as regular wifi client (station) in Linux and supports 2.4G and 5G frequencies (more precisely, 2412-2484, 5180-5875 MHz).
Problem with linux driver. Ubuntu 18