Fangrui Product Details 1. C12 Multifunctional Car Dual Usb Charger Bluetooth Fm Transmitter With Atmosphere Light 2. Colorful Breathing Atmosphere Lights, Seven-color Light Self-adjustment, To Meet Different Needs. 3. Support 5v 3.1a Fast Charging, With Dual Usb Charging Ports, While Charging Does Not Affect The Charging Speed. 4. Compatible With A Variety Of Mobile Phone Sound Software Apps, Broadcast Through Car Audio, And There Is No Restriction On Mobile Phone Models. 5. Mcu+dsp Dual-core Processor, Compatible With Android And Ios Systems, Background Noise Reduction Processing Makes Playing Music And Mobile Phone Calls Clearer. 6. Compatible With Various Brands Of Music U Disks, Up To 32gb Expansion, And The Playback Mode Can Be Switched Freely. (not Shipped With) 7. Power-off Memory Playback Function, Automatic Connection Back. 8. High-resolution, High-performance Stereo, No Freeze, Support Mp3flacape And Other Lossless Music, Multiple Audio Format Playback. 9. Parameters: 10. Frequency Response: 20hz~15khz 11. Fm Transmitting Frequency: 87.5-108.0mhz 12. Bluetooth Version: 5.0 13. Transmission Distance: 10-15m 14. Working Voltage: 10-24v 15. Usb Output: 5v 3.1a 5v 1a