A:Answer Thanks for your interest in the Companion 2 Multimedia Speaker System, Nguyen! Just to clarify, the Series III on this page is the newest model. For the Series III, you can connect your phone to the system using a 3.5 mm auxiliary audio cable. The cable will go from your phone's headphone jack to the "AUX IN" connection on the right speaker. For the Series II, you can use a 3.5 mm "male" to dual-RCA "male" cable to connect your phone. The AUX inputs are indicated by the red and white connections on the right speaker. Hope this helps! Jesse - Bose Support