Scosche Hands-Free Cellular Bluetooth Car Kit Allows Hands-Free Cellular Calls to Play Through Car Speakers Allows User to Wirelessly Stream iPod, Zune & Other Mp3 Players with the Scosche Tz4 Uses Dsp Echo Canceling for Crystal Clear Cellular Phone Communication No Installation Required Answer incoming calls hands-free with most compatible Bluetooth phones through your car speakers Works with all iPods and MP3 players to transmit music to car speakers No Installation required Includes Bluetooth receiver and 3.5mm microphone