* Compatiable with Ipod touch 2G and Iphone 3G (need downloaded software).                                                                                                  * Compatiable with Ipod Nano 4G and 120GB ipod classic (with softward already on the devices).                                                                                * Small and portable                                                                                  * With both microphone and speaker function for recording and playing sounds                                                                                                       * High quality microphone with fine sensibility and excellent recording quality                                                                                                         * Plug and play                                                                                                           * No need battery