Note: It is a normal phenomenon that FM product will have some noise because of the interference of the local radio signal. Please Find an empty or non-interfered frequency and adjust the device to that frequency for minimized static noise. If you can"'"t solve your problem according to the above methods, you can contact our customer service again to help you deal with it. Thank you for your cooperation.Baseus Car Bluetooth 5.0 FM Transmitter Smart Noise CancellationEnjoy High-Quality Live Sound Lossless Audio Decoding Support WMA/APE/MP3/FLAC/WAV lossless format Dual Core Processor, No Background Noise LED Digital Display Shows the voltage once power up Suitable for 12-24V vehicles Double Reminder for Wireless Connection Wireless indicator light flashes and a voice reminder sounds Dual USB Chargers for phones, tablets, computers, etc. Support TF Card/ USB Disk and AUX Outputs Buttons with many functions 1.USB1 2.AUX 3.TF 4.USB2 5.Rotary Knob 6.Ambient Light 7.Left Key 8.Right Key 9.Up Button 10.Down Button Convenient Large Rotary Knob Adjust the volume/FM frequency Audio Navigation Press one button to answer/hang up Auto Re-Connection, not need to set again after Power Failure Circuit Protection for safe driving Stepped Bayonet Never Stop Charging Despite of Strong Bump