【Dual USB Ports & Safe Charging】Supports simultaneous charging of two devices and features overcharge protection. One USB port (5V/1A) with a music note can read USB flash drives, while the other USB charging port (5V/2.4A) efficiently charges your smart devices. Enjoy stereo music in your car while charging your smartphone. 【Three Music Playback Modes】This car FM transmitter supports three clear stereo music playback methods: A. Bluetooth connection; B. USB flash drive (≤32G); C. TF card (≤32G), supporting MP3/WMA/FLAC/WAV/APE formats. 【Blue Ambient Halo】When powered on, the blue ambient halo illuminates, making it convenient to use in dark car environments and creating a pleasant atmosphere; the LED screen clearly displays information such as volume, car voltage, and FM frequency for quick and easy access. [Hands-Free Calling] This Bluetooth FM transmitter features a built-in microphone and uses echo cancellation and noise reduction (CVC) technology to provide excellent hands-free calls; a single multi-function button allows you to answer/reject/hang up/redial calls; music playback automatically switches to hands-free mode when a call comes in. [Wide Compatibility] This Bluetooth transmitter is perfectly compatible with iPhones, iPads, Samsung, HTC, Sony tablets, and other Bluetooth-enabled devices (such as MP3 and MP4 players). It is also suitable for all cars/trucks (12-24V).