HX-MP301 Play iPod/MP3 Player/Flash Drive via your car stereo and sounding from vehicle's stereo system... Turns Your USB Flash Drive/Key or USB Hard Disk (HDD) into A MP3 Player! Enjoy Your Digital Music With You In Your Car! And no, you do not need to have a MP3 Player, not need to modify car, just An USB Flash Memory/Drive/Key or USB HDD! -------------------------------------------------------------------------------- Feathers: 1. Built-in FM Transmitter 2. Multi-channel (frequency) support: 15 FM channels 3. LED show the voice percent and ordinal number of song. 4. Supports USB flash drives, most USB hard disk (HDD), 2.5 HDD only recommended (max 80G). 5. Line-IN function enables you to enjoy music from the external audio device such as CD, MD, DVD player. 6. Car cigar socket power supply (12V DC power) 7. Supports MP3 file format