Automatic Frequency Tuning Are you tired of tuning FM frequency by repeatedly pressing button? Bluetooth fm transmitter can automatically scan EMPTY Radio station in 1 second. You only need to briefly press the CH button of the bluetooth hands-free car kit twice at intervals. 3 USB Ports & QC3.0 Quick Charge One USB port for reading U disk only, one standard 5V / 2.4A USB charging port and one QC3.0 port with quadruple charging speed compared to the normal load. Now you can simultaneously charge 2 phones quickly while listening to music with Car Adapter. 1.8 Color Display & Flexible Collar The LCD display is large and clear enough for you to easily read voltage, volume, song name (TF / U-disk modes), incoming number, channel , etc. the day and the night. car bluetooth transmitter and its neck is very flexible for better fit. 5 EQ Clear Sound Modes Adopted by CVC noise cancellation technology, car bluetooth fm transmitter, its sound quality is phenomenal when playing via U disk / TF card / Bluetooth / Aux Cord, and it also supports CLASSICAL / POP / ROCK / JAZZ / NORMAL music styles when using U disk and TF card. Hands-Free Calling & Stable Connection With its top-notch MTK bluetooth chip, fm transmitter its connectivity is stronger and more stable, without random disconnection problems. The sensitive built-in microphone also works clearly for hands-free calls, making your driving safer and more convenient. Specification FM Frequency Range: 87.5 MHz-108.0 MHz. Compatible audio format: MP3. WMA. WAV. FLAC. AAC. Compatible with Bluetooth: V1.2 / V2.0 / V2.1 / V3.0 / V4.0 / V4.2 / V5.0. Compatible Bluetooth protocol: A2DP / AVRCP / HSP / HFP. Quick Charge Port: Support QC 3.0 protocol (DC3.5-6.5V / 3A, 6.5-9V / 2A, 9-12V / 1.5A). Audio output: U disk (32 GB max.), TF card (32 GB max.), Auxiliary cable, Bluetooth. Note: Please read the user manual carefully before use.