SF Cable 3.5mm Male to 2.5mm Female Stereo Headphone Adapter This adapter converts the 3.5mm male to 2.5mm female. Ideal solution for connecting your stereo headphone with 2.5mm to CD/DVD players, MP4, ipods, mobiles, and other devices with 3.5mm audio socket. Input: 3.5mm male Output: 2.5mm female Lifetime Warranty