1. Bluetooth version 5.0 2. Support calls (long press the pause button to answer calls) 3. Support recording. Recording only supports operation in TF mode or USB mode. (Long press the MODE button to start recording, long press the MODE button again to cancel recording and play the recording file; exit recording mode by long press the pause button to exit. When recording, a storage device needs to be connected, such as a USB flash drive or TF card) 4. Support power-off memory 5. The power supply voltage supports DC6v-18v and the current is between 1-3A. It can be directly connected to the speaker with an amplifier. Support song format MP3. Main functions MP3/USB/TF/LINE IN/FM/BLUETOOTH/Remote control Power 50W, true stereo 2x25W. Digital large color screen display. Supports 6.5MM microphone input, with a fixed microphone volume. Colour:Black Material:Plastic Package Contents: 2 x power amplifier board 2 x remote control 2 set x Cable 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.