INTELLIGENT VEHICLE POSITIONING,SMART CAR LOCATOR: This Bluetooth FM transmitter with smart car locator works well with 12V/24V vehicles. It can save current parking location, recognize distance and message you parking time automatically, and creatively help you to find your car in seconds by \"Fast Find Car\"APP. HANDS-FREE PHONE CALL FEATURE: This FM transmitter is built in microphone and provides you with hands-free calling. You can enjoy more comfortable and safe driving experience.This Bluetooth FM transmitter also is a terrific car gift for your friends and families to listen to music, podcasts and audio books while driving. SUPPORTS TF CARD/MICRO SD CARD/ U-DISK MUSIC PLAYBACK: You can also insert U disk/TF card(up to 32G) to play MP3 files. You also can play the music from your phone after you connect BT,but make sure the transmitter\'s FM is the same as car\'s FM first. EXCELLENT STEREO SOUND AND LOW VOLTAGE ALARM: Echo cancellation and noise suppression (CVC) technology, which can offer your crystal clear calls, navigation and music. Imagine that It\'s so wonderful to play 2-3 songs on the way to work or go back home.Cool blue LED digital screen not only display FM frequency but also monitor car voltage. When car voltage is less than 12V, warning with flashing number on the LED display. 2.4A FAST CHARGING USB PORT AND UNIVERSAL COMPATIBILITY: This FM transmitter has two USB charging ports and is compatible with Bluetooth enabled devices. 2.4A fast charging port is for iPhone, Samsung, HTC, LG, Blackberry,Tablet and iPad,Motorola/LG/Nexus Phones/Tablets Mp3 Mp4 Player,etc. Tablet and the other one 1A music port for external USB audio playback, such as,TF Card/Micro SD Card/ U-Disk.