1、More compatibility: wireless Bluetooth FM transmitter adapter for car radio, transfer calls, MP3 music, mobile phone voice to car speakers. Compatible with Bluetooth devices. 2、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. 3、Car battery voltage function: display the voltage for 3 seconds when plugged into the car socket. Always keep the battery healthy. Then it goes to auto play mode. 4、Multifunctional transmitter, echo cancellation and noise processing during calls; Stereo Bluetooth and FM emission technology; Support USB, memory card (not included), Bluetooth function. 5、FM transmitter faster pairing and more stable sound than other common transmitter on the market, which can avoid unstable connection problems effectively. Item Type: Car Bluetooth FM Transmitter Material: ABS Model: E5 Color: Gold Functions: Bluetooth Adaptor, FM Transmitter Application: Cars 1: Bluetooth Hands-free Call 2: Echo cancellation and noise processing during the call 3: Stereo Bluetooth and FM Emission Technology 4: Support USB/Memory Card (not included)/Bluetooth Function 5: Support MP3 Format Music 6: Automatic Power off Memory Function 7: Cigarette Lighter Power: DC12V-24V Voltage Power Supply 8: Bluetooth Version 5.0 FM Transmitting Frequency: 87.5 ~108Mhz 9. Voltage Detection 1 x Adapter 1 x Audio Line