Monoprice 107154 2.5mm to 3.5mm Mono Plug Jack Adaptor, Metal, Gold Plated Metal 2. 5mm Mono Plug (male) to 3. 5mm Mono 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