A. Easy to operate: Simply place the cassette adapter into your car's CD player. Then, the cassette adapter will start on your phone. B. Built - in microphone: The cassette adapter with a built - in microphone supports the call function. C. LED indicator: The cassette adapter with a USB charging LED indicator is convenient to charge. D. Button control design: The cassette adapter with control buttons can be manually controlled. E. Bluetooth 5.0: The cassette adapter using Bluetooth 5.0 technology can be easily paired with your smartphone via Bluetooth connection. F. Type: Cassette adapter G. Color: Black H. Material: ABS I. Package contents: - 1 cassette adapter - 1 USB data cable The package generally includes the above contents and usually no other products. J. Precautions: Light reflection and different displays may cause the color of the item in the picture to differ slightly from the actual product. The allowable measurement error is around ±1 - 3 cm.