Supports Bluetooth 5.0 connection Charging your phone is convenient and fastUSB interface for charging technology , more convenient and faster One key operationBT hands-free calling In BT mode , long press the knob to wake up thevoice assistant function Seven kinds of lights can be switched at willexperience different fun Please note: Installation of this product requires skills. If not, please professional help. Refer to the instruction manual for detailed information. Bluetooth: Search for Bluetooth devices on your cell phone. Use the passkey "0000" to pair with the device. size: 18.8 x 5.8 x 5.5cm Material: plastic colour: Black Package Contents: 1 x car radio 1 x remote control 1 cord 1 x speaker cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.