A Bluetooth receiver is a device that allows audio signals to be transmitted wirelessly from a source, like a smartphone or tablet, to speakers or headphones. It connects to the audio output of these devices, enabling users to enjoy music or calls without the hassle of wires. Bluetooth receivers are commonly used in home audio systems, car stereos, and portable speakers. These receivers work by using Bluetooth technology, which is a short-range wireless communication standard. They typically have a range of about 30 feet and can connect to multiple devices, making it easy to switch between different audio sources.