The product description 1.Bluetooth connection, bluetooth protocol 2.1 above, non-destructive bluetooth transmission, mobile phone and computer can use bluetooth connection directly 2. Support the direct connection between TF card and AUX 3. The radio function has an external antenna, enabling you to search for super-strong signals 4. It has a handle, which is convenient for you to carry, and the volume is so high that it can hold the whole room both indoors and outdoors 5. Have a built-in battery (rechargeable) and two types of external battery, so that your use time can be up to 3-5 hours 6. There are three adjustment modes of the button knob remote control, which makes your operation convenient and happy 7. Equipped with a microphone to make you feel good 8.3D surround sound gives you an immersive experience