[Easy connection]Easy connection and automatic reconnection. The first time you turn on Bluetooth, you can search for S-23 pairing connection. The next time you turn on Bluetooth, it will automatically connect to S-23, making it more convenient and efficient to use | [Stable connection]Bluetooth 5.0 connection is more stable, reduces signal interference, playback does not lag, connection is clearer, built-in antenna design, can achieve barrier free signal transmission within 10m | [Support TF card playback]The playback priority is Bluetooth TF, and the default boot mode is Bluetooth mode. Inserting a TF card will enable TF music playback mode, supporting multiple audio formats such as MP3/MWA/APE/FLAC/WAV | [Power off memory function]After the device is powered off, it automatically stores the playback frequency, volume, and tracks. When the device restarts, the songs start playing without the need for manual adjustment | [Support AUX OUT ]You can choose an AUX audio cable, which can be directly connected to the car audio system without the need for FM modulation to avoid wireless signal interference, resulting in clearer sound quality and more stable calls