The Realtek RTL8761AU is a compact Bluetooth USB controller designed for wireless communication in PCs and embedded devices. It supports dual-mode Bluetooth (BR/EDR and BLE) and is compatible with Windows and Linux systems. The chip enables fast, stable connections for peripherals such as keyboards, mice, headsets, and game controllers. With low power consumption and wide device compatibility, the RTL8761AU is commonly used in Bluetooth dongles and wireless modules, offering reliable connectivity in both consumer and industrial applications.