Specifications:

TuneBase Direct w/Handsfree. Listen to your iPod or iPhone music and talk hands-free through your car stereo system. TuneBase Direct connects directly through your car stereo's auxiliary input jack (3.5mm cable included) so you get the best possible sound for your playlist and your calls. Make and receive calls with the push of a button. If your iPhone is playing music when a call comes in the music automatically fades out. You'll hear the caller's voice on speakerphone loud and clear through your car's stereo speakers.