DIGITAL DISPLAY - The transmitter has a digital display that shows the FM frequency and the battery level for easy use. INDUSTRY LEADING CUSTOMER SUPPORT - We’re faithful with this item and willing to assure every purchased order with 90 days money back. You could always write us email with any issues or suggestions. MINDIGITAL DISPLAY - The transmitter has a digital display that shows the FM frequency and the battery level for easy use.I USB CHARGING - Charge the transmitter from any USB port with the included cable. Can be used for 1-2 hours under full power. QUITE EASY USE - Insert the 3.5mm plug into your device just as you would a pair of headphones. Turn on the transmitter and set it to an FM frequency that's not in use in your area. Set your car radio to that frequency and you'll hear the music! The transmitter will play all audio from your phone, so you can use it to make hands-free calls as well. UNIVERSAL WIRELESS FM TRANSMITTER - This FM transmitter eliminates the need for an audio jack or Bluetooth in your car audio system - just plug it into your phone or MP3 player and turn on the radio!.