Cables4PC New 3.5mm Female to 2.5mm Male headphone earphone adapter for PDA MP3 MP4 Cell Phone This adapter allows you to plug standard (3.5 mm) stereo headphones into the smaller output on these device 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