3-IN-1 Powerful And Smart Function (Handfree・Speaker・Microphone) free Talking On Pc-To-Pc no Driver Needed compatible To Standard Computer And Music Player Devices・Including Pc・ Mac・ Notebook Ect Supports: Msn・ Skype・ Yahoo Messenger・ Icq And Qq Power Sources: Dc 3V (Aaa 2pcs)unit Dimension: 103 43 16 Mm