The Kaiy Bluetooth 5.3 Receiver is a device that allows you to connect your old stereo, home stereo, tablet, or speaker to your phone or other Bluetooth-enabled devices. It has a long-range and superior sound quality, and it supports various connectivity options such as RCA, Bluetooth, auxiliary, USB, and optical digital. The receiver comes with a button controller and is available in a Bluetooth receiver color. The product dimensions are 1.8 x 3 x 3.54 inches, and it weighs 8 ounces.