Hi Peanuts78, I only use my MX Ergo with the (included) Unifying receiver. I hope I have helped you with this answer. Have fun with the MX Ergo - I'm thrilled with it. ... . .
Both .... Unifying&BT ... works perfect ... You can connect 2 devices without any problems; 1 Unifying and 1 Bluetooth and switch between them in a flash.