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 displayCharging interface: support USB 3.1A fast chargingPD interface: support PD fast chargingVoice assistant: support voice assistant functionOne-touch on/off: support one-touch soft shutdown, support any key onLuminous lights: support RGB lightsBattery function: support battery voltage detectionFM function: support FM stereo transmission technologyU disk: support U disk playbackPlayback format: support WMA, MP3, WAV, FLAC music format filesBluetooth compatible format: Compatible Bluetooth support A2DP, AVRCP, HFP, HSPHands-free function: Bluetooth compatible hands-free callingStereo: Bluetooth compatible stereo music DSP supportTechnical frequency: 87.5-108.5mhzSpecification:Shell material:ABSInput: 12-24VOutput: 5V-1.0A or 5V-3.1AC port: 9V-2A or 5V 3.1ATotal power: 7.2A-36WOutput port type: USB, type-cPackage included:1 x Car FM Transmitter Phone charger