FM transmitter with Bluetooth for transferring music and hands-free It can work as an FM transmitter or Bluetooth hands-free. The FM transmitter is equipped with microSD reader, USB reader/charger. Works with all phones with bluetooth. Perfect for e.g. streaming Spotify or other music to the cars sound system/speakers. The device has a built-in microphone for calls and an answer button to answer/hang up. There is also an LCD display that shows the set radio channel you should set the stereo to in order to get the sound out of your speakers. Automatically switches between music and calls/calls and music when it rings or when you hang up. FM transmitter with Bluetooth for transferring music and hands-free It can work as an FM transmitter or Bluetooth hands-free. The FM transmitter is equipped with microSD reader, USB reader/charger. Works with all phones with bluetooth. Perfect for e.g. streaming Spotify or other music to the cars sound system/speakers. The device has a built-in microphone for calls and an answer button to answer/hang up. There is also an LCD display that shows the set radio channel you should set the stereo to in order to get the sound out of your speakers. Automatically switches between music and calls/calls and music when it rings or when you hang up. Specifications: microSD card support 2x USB sockets for USB memory or charging the phone A2DP Music streaming Product parameters: Interface: high-speed USB2.0 Screen: LED screen Source: Cigarette lighter Memory card type: TF card Power supply: DC12-24V Support file type: MP3 / WMA Operating current: 50-100mA DC12V Bit rate: 64-320 kbps FM frequency range: 87.5-108 MHz Signal to noise ratio: 85db (FM: 65db) Harmonic Distortion: