These are basic USB UARTs which can achieve 115200 baud.

In Linux, the reverse engineered driver is imperfect and it's not possible to recommend this device for normal usage but it's a candidate for for testing unreliable serial connections.

The device does not contain a well known USB UART bridge but is comprised of a Philips PDIUSBD12, Philips 87C52 and a MAX232 clone.