Universal 2.5mm Male to 3.5mm Female Stereo Headphone / Speaker Adapter For audio / music output ONLY, audio input not available: Mic on the cell phone headset will not work with this adapter. Adapter converts the electronics' own audio output into 3.5mm output 3.5mm output means unlimited possibilities of device to broadcast the audio sound/music from your electronic Adapter allows connection to any 3.5mm stereo headphone and portable speaker Adapter also allows your phone/PDA to connect to any home stereo system [Note: May require additional RCA Y-Cable] Suggestion: Audio adapter with built-in microphoneCable Length: ~2in / ~5cmOutput: 3.5mm Stereo Socket NOTE: this adapter carries audio output only, not compatible with audio input. Suggested Applications: Most Kyocera, LG, Motorola, Sanyo phones and audio devices with standard 2.5 mm audio socket