Wireless FM Transmitter Radio Adapter Car Kit with 3.5mm Audio Plug and USB Car Charger for Smartphone Tablet MP3 MP4 Auto-scan Function: this helps you to easily find an empty station to enjoy great music Wide Compatibility: comply with all devices including all smart phones, tablets, MP3, MP4 by 3.55 mm audio cable and simultaneously charges your devices through the USB port. Hand-free Phone Call: built in microphone with no worries to reply calls while driving or listening music Easy to Use: press the frequency up and down button control,plus with simply display to read Quality Guarantee :reliable and friendly customer service ready to respond within 24 hour and satisfied you well with any problem with the item itself.