Key Description:1. Bluetooth version 5.02. Support calling (long pre the pause on to answer the call when there is a call).3. Support . only supports operation in TF mode or USB mode.(Long pre the MODE on to start , long pre the MODE on again to cancel the and play the recorded file; exit the mode and long pre the pause on to exit. When , you need to connect a storage device, such as a U disk or TF card;)4. Support power-off memory5. The power supply voltage supports between DC 8v-24v, and the current is between 1-4A.6. Can be directly connected to speakers, with power amplifier and decoding functions.7. Support song format MP3/WMA/WAV/APE/FLAC8. Main functions MP3/USB/TF/LINE IN/FM/BLUETOOTH/remote control/9. Power 120W, stereo 2*60W.10. Support folder selection to play. When USB or TF is playing, there is a folder in the device and there are songs in the folder. Pre the previous on or the next on twice to select the folder to play songs, and the screen will display F001-F00? and so on, yes? A folder displays F00? .Function Description:1. Long pre the MODE on to start , and long pre the MODE on again to cancel the function;2. Pre the MODE on again to play the file;3. When , you need to connect a storage device, such as U disk or TF card;