①. Easy to operate: Just insert the cassette adapter into the car CD player. Then the cassette adapter starts working on your phone. ②. Built-in microphone: The cassette adapter with built-in microphone can support calling function. ③. LED indicator light: The cassette adapter with USB charging LED indicator light is convenient for charging it. ④. Button control design: The cassette adapter with control button can be easily operated manually. ⑤. Bluetooth 5.0: The cassette adapter with Bluetooth 5.0 technology can be conveniently connected to your smartphone via Bluetooth connection. ⑥. Type: Cassette Adapter ⑦. Color: Black ⑧. Material: ABS ⑨. Package Contents: 1 x Cassette Adapter, 1 x USB Cable ⑩. The above package contents only, other products are not included. ⑪. Note: Due to light reflection and different displays, the color of the item may be slightly different from the actual item. Please allow +/- 1-3cm error due to manual measurement.