Easy to operate: Just put the cassette adapter into the car disc player. Then the cassette adapter starts to on your phone . Built-in microphone: The cassette adapter with built-in microphone can support calling function. LED indicator light: The cassette adapter with USB charging LED indicator light is convenient to charge it. Button controlling design: The cassette adapter with controlling button can be controlled manually. Bluetooth 5.0: The cassette adapter with Bluetooth 5.0 technology can on your smart phone by Bluetooth connection conveniently. Type: cassette adapter Colour:black Material:ABS Package Contents: 1 x cassette adapter 1 x USB 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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.