1、A wireless bluetooth FM transmitter adapter for car radios, which can transmit calls, MP3 music, and mobile phone voice to car speakers, and cigarette lighter power supply is DC12V‑24V voltage power supply. 2、Car battery voltage function, display the voltage for 3 seconds when plugged into the car socket, which keep the battery healthy, then it goes to auto play mode, support stereo bluetooth and FM transmission technology. 3、Hands free function, built in microphone, automatically switch from music playing state to hands free mode when answering a call, one click answer, reject, raise hand, recall, and automatic power off memory function. 4、Support bluetooth, U disk, Memory card, MP3, wma player, with anti interference performance and CVC technology, listen to music while charging, automatic connection and memory pairing after power on. 5、Compatible for iOS, for Samsung, for Google, for LG, for HTC and other bBluetooth devices, and it has noise processing during a call, bluetooth version 5.0 FM transmitting frequency is 87.5~108Mhz, and voltage detection. Item Type: Bluetooth Adapter Material: ABS Color: Black Model: B5 Function: Bluetooth Adaptation, FM Transmission Compatible: Car 1. Bluetooth hands free call; 2. Echo cancellation and noise processing during a call; 3. Stereo Bluetooth and FM transmission technology; 4. Support USB/TF card (not included)/Bluetooth connection; 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 10. Support file types. MP3/APE/FLAC/WAV 11. Working temperature. 0-60℃ 1 x Adapter