Kmise A7843 6.35mm 1/4 Male to 3.5mm 1/8 Female Mono Audio Mic Plug Adapter Jack, 2 Piece Convert your 1/4"(6.35mm)mono headphones to 1/8"(3.5mm) Mono for use with professional audio equipment. Mono in, Stereo out Package include:2 pieces audio adapter 6.35 to 3.5