1、Built in microphone, automatically switch from music playing state to hands free mode when answering a call. One click answer, reject, or recall. 2、The voltage is displayed for 3 seconds when plugged into the car socket. Always keep the battery healthy. Then it goes to autoplay mode. 3、Support Bluetooth, U disk, memory card, MP3, WMA player. With anti interference performance and clear voice capture technology. 4、You can listen to music while charging. Automatic connection and memory pairing after power on. 5、Transmit calls, music, phone voice to car speakers. Compatible with for iPhone, for Samsung, for Google, and Bluetooth devices. 1 x Car Bluetooth Adapter1 x Audio Line Item Type: Car MP3 PlayerMaterial: ABSModel: C6Colour: BlackFunction: Bluetooth Adaptation, FM TransmissionScope of Application: Car 1. Bluetooth hands free call; 2. Noise reduction processing during a call; 3. Stereo Bluetooth and FM transmission technology; 4. Support USB and memory card (not included)/Bluetooth function; 5. Support MP3 format music; 6. Automatic power off memory function; 7. Cigarette lighter power supply: DC12V-24V voltage power supply; 8. Bluetooth version 5.0 FM transmitting frequency: 87.5~108MHz 9. Voltage detection