eForCity Premium Stereo Headset / Speaker Adapter for Samsung BlackJack & A707/SGH-D900 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 and portable speaker Adapter also allows your phone/PDA to connect to any home stereo system [Note: May require additional RCA Y-Cable] Alternative Item Suggestion: Audio adapter with built-in microphone / Cable Length: 2" / ~5cm / Output: 3.5 mm Stereo Socket