Feature:1. Support bluetooth HFP /HSP/OPP/A2DP/FLAC/PBAP Profiles 2. As soon as the auto starts screen displays its battery voltage, play music from USB (Universal Serial Bus) disk & tf card Specification: Frequency Channels 87.5-108.0 M Hz Transmit Distance 5MAudio Format MP3/WMAFrequency Response 20 Hz-15 K Hz Left & Right Channel Separation 60d Bbluetooth Versionbluetooth 3.0 + EDROperating Voltage DC12V-24 V Power Consumption 1WWork Temperature-10~70 Degree USB Charging Output 5V/3.1 A Package Included:1 X MP3 Player 1 X Cable