1. Bluetooth version 5.0 2. Support calls (long the pause button to answer calls) 3. Support recording. Recording only supports operation in TF mode or USB mode.(Long the MODE button to recording, long the MODE button again to cancel recording and play the recording file; exit recording mode by long 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 DC 3.7V-5V and the current is around 1A. It can be directly connected to the speaker, with a power amplifier of 2 x 3W. Support song formats MP3/WAV/FLAC Main functions MP3/USB/TF/LINE IN/FM/BLUETOOTH/6.5MM microphone Power 6W, stereo 2 x 3W Remote control: 2 AA batteries Due to different batches, there may be differences in product appearance and printed text, which not affect use Colour:Black Material:ABS Package Contents: 2 x Decoder Board 2 x remote control 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.