Important Instructions: 1.SAVE THIS INSTRUCTION-This manual contains important safety and operating instructions for the product. 2.Before using the product,read all instructions and cautionary markings on Vehicle Battery Adapters. 3.For the best audio quality,please turn the volume of your phone and FM transmitter into the max level, and then adjust the car volume. 4.If the noise is too loud,please try another blank FM station. 5.The signal of any FM transmitter sometimes can be interfered by the surrounded radio or the similar frequency signal thus cause noise,this is normal. 6.To prevent your car battery from being drained,please unplug the product after you turn off the car. 7.Do not expose the product to rain, moisture, or snow. 8.Do not disassemble the product,incorrect reassembly may result in a risk of electric shock or fire. 9.To reduce risk of electric shock,unplug the product before attempting any maintenance.Turning off controls will not reduce this risk. Features: 1.Dual microphones to get better sound quality during call. 2.9 light color modes:Rainbow,Breathing rainbow,Red,Green,Blue, Yellow,Purple,Cyan,White,light switch design of the outer circle creates new atmosphere to the car interior space. 3.Activate phone voice control like Siri,Bixby,Google Assistant,etc. 4.18W QC3.0 and 20W PD port for fast charge, QC3.0 output 5V 3A/9V 2A/12V 1.5A max,PD output 5V 3A/9V 2.22A/12V 1.5A max. 5.Transmit the music/navigation of your Bluetooth enabled phone to car stereo via FM signal. 6.Transmit the music from U disk/micro SD card(Up to 32G)to car stereo via FM signal. 7.Bass boost function just by one button press. 8.Display FM frequency and car voltage together. 9.Play lossless music from U disk/micro SD card. 10.Free your hands,answer hands-free phone calls during driving. 11.Bluetooth V5.0,auto connect last device.Dual Microphones & Hands-Free Calling: This Bluetooth Car Adapter utilizes dual microphone, greatly pick up voices from all direction while driving benefited from superior sound reception and noise suppression (CVC) technology effectively reduce road and wind noises. The hands-free car kit make your driving more smarter and safer.Hi-Fi & 1-Key Bass Booster: The FM Transmitter Bluetooth 5.0 with DSP technology could deliver 2x steadier transmission speed without distortion for Hi-Fi stereo music. Music Player FM Transmitter with a 1-key enhance Bass button, you can select your favorite mode between Hi-Fi or deep bass mode by pressing the button B.QC 3.0 & PD 20W Quick Charging: FM transmitter for car Coming with 2 USB ports(QC3.0 and PD 20W), You can charge two devices simultaneously. The PD Port up to 20W output, compatibility with lastest iphone, ipad, cellphones, tablets etc.7 Colored LED Strip & Music Play Modes: FM Transmitter Bluetooth car adapter supports 7 colors LED backlight, including red / green / blue / yello / purple / cyan / silver white, will give you a visually stunning display of colors, which is a nice way to match the colors already in the car. You can stream music on your car stereo via Bluetooth/ USB Disk (32GB) / microSD Card (32GB).LED Voltmeter Display & Voice Assistant: The FM transmitter will display cars voltage when plugged into the cigarette lighter. Keep abreast of car battery health at all times to avoid problems when driving. Also it support active Siri, Google Assistant or Samsung Bixby to make phone calls.