ITEM NAME:2pcs 2.5mm Male To 3.5mm Female Audio Stereo Headphone Converter Adapter Lt.2 pcs 3.5mm Female Socket to 2.5mm Mini Jack Headphone Converter Adapter. Can connect to any 2.5 mm stereo headphone. For audio / music output ONLY, audio input not available. Adapter converts the audio output into universal 2.5 mm output.