The Aksonic BRX01 HD is a Hi-Fi Bluetooth receiver with a built-in high-performance DAC. It supports Bluetooth 5.0. It supports high-quality apt-X HD. It has multiple connection options such as RCA and optical digital, allowing it to connect to various audio systems. It is a receiver for creating a wireless environment with audio systems that do not support Bluetooth. The size is approximately 7.5cm (height) x 9cm (width) x 2cm (depth) (excluding antenna and protrusions), making it a compact size. The items for sale are the receiver body, USB cable, power socket, and optical cable. I was using the optical cable connected to a USB DAC.