Most Advanced Bluetooth 5.3 Technology & Hi-Fi Deep BassV5.3 car bluetooth fm transmitter optimizing the transmission delay and connection defect problems, which will bring you a faster, more stable and smarter connection with less sound quality loss,uninterrupted calls and music experience. Just press the button "Bass" and you will enjoy powerful deep bass and immersive stereo sound, taking your passion for music to a new level. Clear & Stable Hands-Free CallingHands-free design makes your driving easier and safer. Supports Siri, Google voice navigation. Simply click the MFB to answer/hang up/reject/redial calls, seamlessly switches between incoming calls and music. High-performance microphone grants you crystal clear call. Enjoy complete voice-control and safer driving with this Bluetooth transmitter. 3 Playing ModesThis car bluetooth transmitter provides Bluetooth, U disk (64GB max) and TF Card (32GB max) as three playback methods. The Bluetooth radio transmitter will restore the real sound and powerful bass, providing the ultimate listening experience. Long press "M" button to switch playing modes sequentially BT---U disk---TF card. Humanized Ambient Light DesignIndulge in a delightful driving experience with our trendy rainbow light design and have full control over your driving atmosphere. Immerse yourself in fun while having the convenience of easily turning off the light by Double Click the "Bass" button when not needed, which switch color sequentially (red, green, blue, yellow, purple, breathing light, off).