2.5mm (Male) to 3.5mm (Female) headphone dapter (Converts your 3.5mm earphone jack into 2.5mm earphone jack) (Black) This adapter allows you to convert 3.5 mm stereo headphones into the smaller 2.5mm stereo headphone Enable your headset to use a standard headphone jack to get full stereo sound. Work with all your audio devices, including: iPODs, Cellphone, PDAm MP3, MP4, Discman, Walkman