A Bluetooth transmitter is a device that allows you to stream high-quality audio from your phone or tablet to speakers or headphones. It emits a signal that you can control with your mobile device. Conversely, Bluetooth receivers can be connected to either analog or digital stereo systems, enabling you to listen to music from your phone through the speakers. Usually, Bluetooth transmitter and receiver won't design together as a device. But B50 Bluetooth Amplifier does.