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FM transmitter. A compact gadget for broadcasting music from a smartphone, USB flash drive or memory card through a conventional radio (without Bluetooth and corresponding connection interfaces). The FM transmitter works from the car cigarette lighter socket, the sound from it is transmitted to the acoustics of the car. The radio tape recorder "sees" the device on the transmitter's broadcast frequency, which can be selected in the FM frequency band free from radio stations.
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BT receiver. Bluetooth adapter for listening to music, podcasts or audiobooks from your smartphone through your car's speakers. Usually, the gadget is connected to the radio via the AUX input; with mobile devices, the receiver keeps in touch via a Bluetooth wireless network. Usually, no settings are provided in BT receivers - they are intended purely for transmitting an audio signal.