Functions: It can automatically detect the car battery voltage at real time and supports voice broadcast service. Intelligent Bluetooth mp3 player supports music displaying in all kinds of music APP on your phone by net. It supports lossless audio decoding high resolution high performance stereo supports WMA APE FLAC WAV and other lossless music formats. (97% of car Bluetooth on the market does not support FLAC and APE formats) With the upgraded version 5.0 Bluetooth chip the connection is more stable and the automatic connection is faster. Dual USB car charger provides fast rapid charging: 3A \/ 3.6-6.5V 2A \/ 6.5-9V 1.5A \/ 9-12V and intelligent identification charging 5V \/ 2.4A function. The fast charging's speed is 4 times faster than ordinary 5V \/ 1A. (Mobile phone needs to support for QC3.0 function) It supports playback breakpoint memory function supports button operation to switch folder playback and supports one-key operation to adjust the volume answer hang up call back. Feature: Rated working voltage:12V-24V Limit working voltage:8-27V USB output:USB1 5V\/2.4A USB2 Quick Charge3.0 Working temperature:0-60 Charging recognition:USB2 with Qualcomm Quick Charge3.0 protocol Music format:MP3WMAWAVFLACAPE SNR:>60dB Degree of distortion: