@GB Features: 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 Battery memory: automatic power-off memory function FM function: support FM stereo transmission technology U disk: support U disk playback TF card: support TF card music playback Playback format: support WMA, MP3, WAV, FLAC music format files Bluetooth compatible format: Bluetooth compatible 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 Shell material surface technology: fine grain, high gloss Features: Appearance patent Input: 12-24V Output: 5V-1.5a or 5V-3.1A C port: 9V-2A Total power: 7.5-20W Output port type: USB, type-c Protocol: Bluetooth 5.0 Package size: 114.76mm*70.62mm*52.55mm Package weight: 53g Bare machine weight: 34g Package included: 1 x Car Bluetooth compatible transmitter,1 x Packing box NOTES:1. Please allow 1-3 cm error due to manual measurement. 2. Due to differences in different monitors, the picture may not reflect the actual color of the product. Thank you.