Question about Logitech MX Master OEM

Dongle is included with OEM, but I use Bluetooth. The mouse is very ergonomic and has many configurable functions that are easy to use. I am really satisfied.

The OEM mouse does come with USB receiver.
So at least, one can connect this mouse to 2 devices via Bluetooth and USB Receiver, though they claim that it can be connected to 3 devices and, indeed, there are 3 leds in the bottom of the mouse there the button to switch between this 3 connections is placed (maybe extra one via Bluetooth as well?).
One factor that should be noted, the USB receiver and Bluetooth has different input lag, this is not a gamer mouse in the end.
Also, Receiver and Bluetooth use 2.4GHz radio bandwidth.
Thus, if this bandwidth is heavy polluted by nearby routers, Bluetooth is preferred as it jumps between frequencies to mitigate the interference.

The "normal MX Master comes with a dongle in any case. This is also described as being compatible with "radio, RF wireless + Bluetooth". Unfortunately, I cannot say with 100% certainty whether the dongle is included with the OEM version, but I assume that it is.