Silver Tone Metal 3.5mm Female to Female Jack Audio Connector 3.5mm female to female stereo couplers are used to connect two stereo cables together to make a longer cable Good for extending connections or making conversions from one plug to another. Size : 3.7mm x 1cm / 1.5" x 0.4" (H*D);Material : Metal Color : Silver Tone This adaptor is designed to couple audio cables with mini stereo phone plugs Metal 3. 5mm Stereo Jack (female) to 3. 5mm Stereo Jack (female) Adapter - Silver tone. It works with mono or stereo plugs. <span class="a-text-bold">Audio</span>Female to Female<span class="a-text-bold">Adapter</span>. Use with PC,<span class="a-text-bold">stereo</span>, MP3 players, Mobiles. It is a stereo-audio type headphone connector that can provide you the optimum sound quality.