Description: Dual USB Port :Charge two devices simultaneously with the dual USB port feature. PD Charging :The PD charging feature ensures fast and efficient charging for your devices. Bluetooth Hands-Free :Stay safe while driving with the Bluetooth hands-free feature that allows you to take calls without taking your hands off the wheel. True 3.1A :The true 3.1A feature ensures that your devices charge quickly and efficiently. Product description: Display: Dual-screen digital tube display Charging interface: support USB 3.1A fast charging PD interface: support PD fast charging Voice assistant: support voice assistant function One-touch on/off: support one-touch soft shutdown, support any key on Luminous lights: support RGB lights Battery function: support battery voltage detection FM function: support FM stereo transmission technology U disk: support U disk playback Playback format: support WMA, MP3, WAV, FLAC music format files Bluetooth compatible format: Compatible Bluetooth support A2DP, AVRCP, HFP, HSP Hands-free function: Bluetooth compatible hands-free calling Stereo: Bluetooth compatible stereo music DSP support Technical frequency: 87.5-108.5mhz Specification: Shell material:ABS Input: 12-24V Output: 5V-1.0A or 5V-3.1A C port: 9V-2A or 5V 3.1A Total power: 7.2A-36W Output port type: USB, type-c Package included: 1 x Car FM Transmitter Phone charger