【FM TRANSMITTER】TYKEVO car FM transmitter will allow you to stream music from an external device such as a smartphone, tablet or other bluetooth device directly to the car radio. You can also play music stored on a Pen Drive or TF card by connecting them directly to the device. We can also access the functions of Siri / Google assistant and answer / reject calls | 【BATTERY VOLTAGE】The bluetooth 5.0 adapter with USB for the car cigarette lighter socket (12/24V) has a screen that shows the battery voltage in real time, as well as an icon that shows the bluetooth status ( pairing/pairing) and the chosen FM frequency. It is very easy to install and adjust. The package includes instructions translated into Spanish detailing all the functions of the device | 【FAST CHARGING USB PORTS】The bluetooth car mp3 player has different input and output ports: one QC 3.0 fast charging USB port, one USB port for Pen Drive/U disk input to play music, one USB port Type C PD fast charging and an SD card reading slot. The device can automatically change the playback mode when inserting the USB or SD card, also by pressing and holding the M button we can switch between modes | 【HANDS-FREE FUNCTION】The hands-free function is easy to use, we only need to pair the mobile with the device. By pressing the central wheel once we can answer calls, twice in a row to hang up, if we leave it pressed while we have an incoming call, we can reject the call. If we press twice (without incoming/outgoing call) it will make a call to the last number and if we leave it pressed, we will access Siri or the Google voice assistant | 【UNIVERSAL COMPATIBILITY】The cigarette lighter fm transmitter has universal compatibility with all vehicles with a 12/24V cigarette lighter as well as smartphones, tablets and bluetooth devices. It is a quick, easy and cheap way to have a hands-free and a music player in any vehicle