1. Driver-free, plug and play, Bluetooth fast matching connection, more convenient to use. 2. The speaker can be connected to the mobile phone freely, which is convenient and fast. 3. Insert the TRANSMIT hole in the transmitting mode, and insert the RECEIVE hole in the receiving mode. 4. Built-in Bluetooth 5.0 dual system, independent circuit design, more powerful performance, it can not only receive signals but also transmit signals via Bluetooth. 5. Parameters: Material: ABS Bluetooth version: V5.0+EDR Bluetooth protocol: AD2P Transmission distance: 10 meters