The Esinkin Wireless Bluetooth Audio Receiver is a black adapter designed for music streaming sound systems. It features Bluetooth connectivity with 3.5mm and RCA ports, making it compatible with various audio receivers. The compact design, with dimensions of 0.94 x 1.97 x 1.97 inches, allows for easy placement and use. Additionally, the device can access PC speakers via AUX and home stereo speakers via RCA, providing versatile options for enhancing your audio experience.