FM transmitter with Bluetooth for music transmission and hands-free function. It can be used both as an FM transmitter and as a Bluetooth hands-free function. Fully compatible with all Bluetooth mobile phones. Can be used to play music via Spotify or other music to the car stereo system/speakers. The device has an inbuilt microphone for calls and an answer button for answering/hanging up calls. There is also an LCD display that shows you which radio channel you should set your stereo to in order for the speakers to sound their best.The FM transmitter can also be used as a car charger. Specifications: 2 USB sockets (3.1A and 1A) A2DP Music Streaming Product Parameters: Interface: Hi-Speed USB2.0 Screen: LED Display Power Supply: 12V Socket Power Supply: DC12-24V Supported File Types: MP3/WMA Operating Current: 50-100mA DC12 Bit Rate: 64-320 kbpsFM Frequency Range: 87.5-108 MHzOBS! The colour of the display/screen may differ from the picture! Compatible with all Bluetooth devices. FM Transmitter with Bluetooth for music transmission and hands-free function. It can be used as an FM transmitter as well as a Bluetooth hands-free. Fully compatible with all Bluetooth-enabled mobile phones. Perfect for playing music via Spotify or other music to your car's audio system/speakers. The FM transmitter can also be used as a car charger only.