Motorola Original SYN1504A Mini-USB to 3.5mm Stereo Headset Adapter Adapter converts the phone's own audio output into universal 3.5 mm output 3.5 mm output means unlimited possibilities of device to broadcast the audio sound/music from your phone Adapter allows connection to any 3.5 mm stereo headset Adapter also allows your phone/PDA to connect to any home stereo system [Note: May require additional RCA Y-Cable] Adapter also allows your phone/PDA to connect to any home stereo system [Note: May require additional RCA Y-Cable]