1. Bluetooth version 5.0. 2. Supports microphone and headphone functions. 3. Support for calls ( the pause button to answer the call when the call lasts). 4. Supports recording. Recording is only supported in TF mode or USB mode. and hold the MODE button to recording. and hold the MODE button again to cancel the recording and play the recorded file. To exit the recording mode, and hold the pause button to exit. When recording, a storage device needs to be connected, such as a USB flash drive or TF card;)" 5. Support power-off memory. 6. The power supply voltage supports DC 8v to 24v, and the current is between 1 and 4A. 7. It can be directly connected to a speaker and is equipped with power amplifier and decoding functions. 8. Supports song formats such as MP3 / WAV/APE/FLAC 9. Main functions MP3/USB/TF/LINE IN/FM/BLUETOOTH/ Remote control. 11. Support folder selection for playback. When playing via USB or TF, if there is a folder on the device and the folder contains a song, the up track button or the down track button twice in a row to select the folder to play the song. The screen accordingly display F001-F00. By analogy, are there any? The folder then shows F00? . Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.