3.5mm Stereo Plug to 6.35mm 1/4″ Mono Female Socket. into a 6.35mm 1/4″ Mono jack socket. This adapter will convert a Stereo 3.5mm headphone-style input. or 6.35mm MONO plug into a STEREO 3.5mm plug. The color of the product/design received may vary in shade slightly as this depends on the resolution of your computer screen.