FM Transmitter with full Frequency spectrum to avoid frequency overlap. Frequency ranges from 87.7 MHZ to 108 MHZ PLL Technology automatically searches for available station. Channel memory function, stores up to 3 different frequencies. Has both 2.5mm and 3.5mm jacks for various music players. Powered by Charger supplied or Batteries (not included) Charger has additional USB Port that can be used for charging Mobile Phones, Digital Camera,Ipod or any other device with USB Port.