Fivetech Stereo 3.5mm Female to 2.5mm Male Gold Audio Adapter Headphone Jack Converter Metal 2.5mm Stereo Plug to 3.5mm Stereo Jack Adaptor - Gold Plated *Will fit smartphone headsets, however it will not support the speaker or mic functions on the headset. Connector A: 3.5 mm Female Connector(s) B: 2.5 mm Male Stereo 3.5mm Female to 2.5mm Male Gold Audio Adapter Headphone Jack Converter