1. Easy to operate: Simply place the cassette adapter into your car's CD player. Then, the cassette adapter will start on your phone. 2. Built - in microphone: The cassette adapter with a built - in microphone supports the call function. 3. LED indicator: The cassette adapter with a USB charging LED indicator is convenient to charge. 4. Button control design: The cassette adapter with control buttons can be manually controlled. 5. Bluetooth 5.0: The cassette adapter using Bluetooth 5.0 technology can be easily paired with your smartphone via Bluetooth connection. 6. Type: Cassette adapter 7. Color: Black 8. Material: ABS 9. Package contents: - 1 cassette adapter - 1 USB data cable The package mainly includes the above contents. 10. Precautions: Light reflection and different displays may cause the color of the item in the picture to differ slightly from the actual product. The measurement error may be around ±1 - 3 cm.