Is intended to transfer sounds from bluetooth devices (e.g. smartphones) to car speakers, using radio waves. Due to the transmitter, even older car radios (without bluetooth or mp3) can work as a music player or as a speakerphone during calls. It has a cigarette lighter socket to connect additional devices, two USB ports and an integrated charger for 3.4A. One of the USB ports has a function of an external memory stick reader up to 32GB, so you can listen to music in mp3 format from a flash drive. The transmitter allows you to connect two devices simultaneously via Bluetooth. It provides clear sound and very good call quality, with one multifunctional button we can: answer/end/reject calls, dial the last caller, set frequencies, adjust volume, start/ pause/next song - while listening to music. In addition, when switched off and on, the device remembers the frequency, the last song played and the volume, and the built-in display shows the current frequency or voltage in the lighter socket.