Featuring a sleek new design with a user-friendly interface, Soundfly BT provides a live full duplex communication solution using Bluetooth technology through FM transmission to your FM car radio and allows you to speak to callers through an external DSP microphone. Soundfly BT is pairable with any phone equipped with Bluetooth functionality or a connection to a Bluetooth adaptor. Bluetooth A2DP technology enables wireless transmission of music from your cell phone. If an incoming or outgoing call is made, the music will be paused. The transmission of music will resume automatically when the call is ended. Soundfly BT also lets you listen to sound files such as MP3 & WMA file stored in portable memory devices like USB flash memory & SD card, etc through your car radio speakers. It supports RDS (Radio Data System), so when you receive a phone call, caller id will be displayed on your car stereo, or while listening to music, you can see the song and artist/'s name displayed on your car stereo. Soundfly SD transmits to all FM frequencies (88.1MHz-107.9MHz) and memorizes up to 7 FM frequencies. It is equipped with a fully functional remote control. You can answer/end calls, change volume, change frequency, folder shift, fast Forward & Rewind, Repeat or Bookmark your favorite songs through the remote. Note: You need to do iPhone OS 3.0 Software Update on your iPhone 3G for A2DP Bluetooth Stereo connection. Because of iPhone's Bluetooth AVCRP capability, this unit can only support vol +/- and play/pause functions. Track forward or back functions are not supported until it is changed in iPhone's new update