The onn. Bluetooth FM transmitter has a 1.44 inch screen for better displaying information like phone calls, FM channels, music, car battery voltage,song name, lyric etc. The ideal screen size to assist you in driving safe without disturbance.The rotatable Gooseneck can provide you with an adjustable viewing angle.7EQ modes(Normal/Pop/Rock/Jazz/Classic/Soft/Low Bass). With the Bluetooth 5.0 technology, it can provide a more stable and faster connecting without intermittent disconnection.All in one button for hands-free calls: answer/reject/hand up/recall make you seamlessly switch between incoming calls and music. Enjoy complete voice-control and safer driving with this Bluetooth transmitter.The Bluetooth FM transmitter can charge two devices fast at the same time via PD18W and 2.1A. One touch to wake the voice assistant(Smart Device). It supports Bluetooth/ Flash Drive/ MicroSD Card(MP3/WMA/WAV/FLAC) and AUX In.The onn.Bluetooth FM transmitter for car is compatible with most devices on the market, such as iPad, iPhone, iPod, HTC, Galaxy, Sony, MP3 player, tablet and Android Smartphones. You can play your favorite songs on your car stereo via Bluetooth, TF Card and Aux Cable. And it fits 12V-24V cars and trucks.Using Tips: If the sound is poor quality, please change to another unused FM station. If no audio transmitted, adjust the device FM station to match the vehicle FM station. If the car stereo is very noisy in radio mode, turn up the volume of the device and turn down the volume of the car stereo to reduce noise. If it can’t recognize the MicroSD card or flash drive, replace the memory card with a capacity less than 128GB, because the slot only support up to 128GB.