Thank you, good day Crystalline reading and game model of 3 music If the transmitter is equipped with Bluetooth, you can enjoy crystalline music through 3 modes: Bluetooth, SD card (32 GB) and USB stick (32 GB). Supports the form of music: MP3, WAV, WMA, Flac, APE 2 Ports USB Car Charger The Bluetooth FM Transmitter Car provides you with 2 USB ports. 5V / 2.4A for load and 5V / 1A (with music symbol) to recognize the USB key or charge. Thus, 2 devices can be loaded at the same time This Bluetooth adapter is compatible with the existing navigation application on your phone. No need to look down for safe driving. Ambient battery voltage indicator The car transmitter will display the voltage of the vehicle as soon as it is connected to the Cigarette lighter of the car. Then you can easily know the condition of the car battery. The blue circle below simplifies the operation for safe driving wide compatibility This hands-free car kit can be associated with any Bluetooth device. Suitable for iPhone, iPad, Samsung, HTC, BlackBerry, Sony, Tablet and other Bluetooth compatible devices such as MP3 players, MP4. With the wider frequency of 87.5 MHz at 108 MHz, you get a more stable and coherent musical experience without interference Reliable handsfree system Bluetooth 4.2 Provides solid connections And stable for reliability hands-free call. This built-in microphone frees your hands completely, offering you a safe and relaxed driving experience. Intelligent voice navigation Connected to your mobile phone via Bluetooth, the emitting car FM announces to navigate from the application of your mobile phone. Enjoy an effortless driving during your trip. Dual USB port and secure loading Supports the load of 2 devices at the same time and offers overload protection. The USB port (5V / 1A) can recognize the USB key, another (5V / 2.4a) maintains your iOS or Android device efficiently loaded.