The BM-8761BUV is dual-mode (BR/EDR + Low Energy) USB Adapter and using Realtek RTL8761BUV chip complies with Bluetooth 5. It combines a BT Protocol Stack for LM, LL, L2CAP, GATT, RFCOMM, SPP and LE.
The BM-8761BUV is compatible with previous versions, including v2.1 + LE. For BR/EDR, it allows multiple active links in either slave mode or master mode. For Low Energy, it supports multiple states and allows multiple active links in slave mode. A BR/EDR link and an LE link can be active at the same time.