eForCity&reg; 3.5mm Headphone Adapter Compatible with Samsung&copy; BLACKJACK II 2 I617 Adapter allows connection to any 3.5 mm stereo headset or portable speaker.Adapter also allows your phone / PDA to connect to any home stereo system [Note: May require additional RCA Y-Cable]. NOTE: For audio / music output ONLY, audio input not available: Mic on the cell phone headset will not work with this adapter.Adaptor converts the phone's own audio output into a universal 3.5 mm output. 3.5 mm output means unlimited possibilities of device to broadcast the audio sound / music from your phone. Output: 3.5 mm Stereo Socket.Color: Black. Accessory ONLY. Cell phone not included. Samsung?is a registered trademark in the United States or other countries. Samsung?does not endorse use of these products