RTL8761B is a highly integrated  Dual Mode Bluetooth5 Transceiver controller chip with UART/USB interface.. It combines BT Protocol Stack (LM, LL,and LE), BT Baseband, modem, and BT RF in a single chip. RTL8761B  complies with Bluetooth core specification v5 and supports dual mode (BR/EDR+Low Energy Controllers). It is compatible with previous version 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. RTL8761B is suitable for Host device such as PC/TV/OT/Box/Broadband/Automotive applications.