Specifications: 1. Power from Car Lighter direct (DC12V), convenient for use. 2. With its inside flash memory: (128MB/256MB/512MB/1G), can be used as a USB flash drive. 3. Decode the format of MP3, WMA, WMV, ASF files. 4. The key-switch is easy to switch the frequency between 87.7/87.9/88.1/88.3/88.5/88.7/88.9MHz. 5. Play & Search MP3 files automatically 6. Making a earphone hole in this unit, be able to work with any audio playing device such as CD, VCD, DVD, recorder, etc.; 7. No need to change any device of car. Plug and play. 8. High speed transmission with Standard USB1.1 / USD2.0. Used as a USB flash driver. It use high quality MP3 decoder chip decode MP3/WMA, etc. Files from inside flash memory to audio signal then through Fm transmitter chip change FM signal and transmit it and play high quality music by FM radio of car.