Monoprice 107124 3.5mm Stereo Jack Adaptor to 2.5mm Stereo Plug, Gold Plated This adapter has a stereo 3. 5 mm female TRS jack and a stereo 2. 5 mm male TRS plug The connectors are gold plated to ensure a smooth corrosion-free connection Important: Although this adapter will physically connect a headset to a smartphone headset/microphone jack this will not allow use of the microphone