FM-transmitter is an electronic device that modulates and transmits audio signals over a radio frequency carrier wave. It is typically used to broadcast audio signals from a source device, such as a computer or smartphone, to a FM radio receiver. FM transmitters can be used in a variety of settings, including in-car audio systems, home and office audio systems, and public address systems. They are also widely used in wireless microphone systems and other wireless audio applications. Some of the key features of FM transmitters include frequency modulation, adjustable output power, and wireless connectivity options such as Bluetooth and Wi-Fi.