[2015 Upgraded with Auto-scan] iClever IC-F30 Universal FM Transmitter With Rechargeable Battery + 2.1A Multi Car Charger for Smartphone, MP3 MP4 and any Audio Player with 3.5mm Audio Jack, Black LCD display with blue backlight. Built-in Rechargeable Lithium Battery. Simply Two button controls Auto-scan function helps you to easily find an empty station(Press the frequency "down" and "up" buttons simultaneously to use this function) Stream music from any 3.5mm music player to your home or car stereos. Transmits on FM channels 88.1 MHz - 107.9 MHz, 0.1Mhz/step Allows hands-free phone calls through the car stereo. Extra USB port to charge an extra device while driving Compatible with any Smartphone or audio player with a 3.5mm audio socket