Features: [BT 4.1]: This speaker supports BT device with A2DP function. Integrated with BT, it can be connected with BT devices within 10 meters. [Multi-functional Speaker]: Multi-functional speaker allows to switch modes between BT mode, TF card mode, Line in mode. Multiple modes for music enjoyment. [High Fidelity Sound Quality]: Enjoy crisp and clear audio with impressive 360Surround Sound powered by 4W acoustic drivers. [TF Card Reader]: Supports insert TF card playing, up to 32G extended memory supported, intelligent voice prompt operation of the function status. [Hands-Free Call]: BT function supports hands-free call. Remote control for convenient experience.