Monoprice 107157 2.5mm Stereo Plug to 3.5mm Stereo Jack Adaptor, Gold Plated Metal 2. 5mm Stereo Plug (male) to 3. 5mm Stereo Jack (female) Adaptor - Gold Plated Will fit smartphone headsets however it will not support the speaker or mic functions on the headset. Item received may not match photo or specs shown It is a reliable and efficient product for you