Description1. Bluetooth version 5.0.2. The amplifier chip adopts TPA3116.3. Support calling (long press the pause button to answer the call when there is a call)4. 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 the recording and play the recorded file; exit the recording mode and long press the pause button to exit. When recording, you need to connect a storage device, such as a U disk or TF card;)5. Support power-off memory6. The power supply voltage supports between DC 8v-24v, and the current is between 1-4A.7. Can be directly connected to speakers, With power amplifier and decoding functions8. Support song format MP3/WMA/WAV/APE/FLAC9. Main functions MP3/USB/TF/LINE IN/FM/BLUETOOTH/remote control/10.Power 100W, stereo 2*50W.11.Support Folder selection playback. Press FD+ for the next folder and FD- for the previous folder. Return Policy All of our items come with a 30-day free return policy. If you need to return, please contact us, let us know the detailed problem and send us some pictures for confirmation. We reserve the right to refuse any returns for objective reasons. Shipping Policy All of our items are shipped free with tracking numbers. Orders will be shipped within 3 working days upon receipt of payment. Most orders will be shipped within 1 working day. In most cases, shipping takes 8-12 working days.