Bluetooth 5.0 transmission technology allows fast connection and stable signal. Automatically connect memorized paired when power on. Rotate function button allows you to easily select FM channels and Play / Pause / Answer / Hang up phone calls. It has two USB charging ports, it can charge two devices at the same time and has overcharge protection. The device is safer when charging. The fm transmitter with bulit-in smart chip will divide the voltage based on the need of device automatically. Plug car audio fm transmitter into the cigarette lighter socket, set the Car FM Radio to an empty station (87.5-108.0 MHz) and tune the FM Transmitter to the same frequency. Pair your phone and fm transmitter via Bluetooth, and then enjoy your music Built-in microphone with CVC noise reduction technology to create full duplex sound quality offer you hands-free talking and navigation voice broadcast. Just press the button to answer/ hang up/ reject/ redial calls, seamlessly switches between incoming calls and music. Hands can be free for safe driving. Bluetooth Car FM Transmitter is compatible with most Bluetooth enabled devices, supports play music via Bluetooth, TF card and USB disk and it will automatically detect and play the MP3/WMA/FLAC/WAV/APE format music .Widely compatible between any devices which support bluetooth and cars in 12-24V. Note: Due to the difference between different monitors, the picture may not reflect the actual color of the item Please allow 0.1-1cm difference due to manual measurement, thanks Other accessory demos in pictures are not included. Size: 43*36*75MM Shipping color: black Shipment Quantity: 1