CESS 2.5mm Stereo TRS Male to 3.5mm Stereo TRS Female Adapter - 2.5mm Stereo Male to 3.5mm Female (4 Pack) 3. 5mm Stereo female to 2. 5mm Stereo male Adaptor Work with all your audio devices, including: iPODs, Cellphone, MP3, MP4, Discman, Walkman It is a reliable and efficient product for you Package Included 4 Pieces Adapters