This is the 3.5mm Stereo Male to 3.5mm Stereo Male Coupler Adapter. It features a 3.5mm Stereo Male connector on both sides. 3.5mm, also known as 1/8 inch, is an audio connector typically found on computers, laptops, smartphones, and tablets. Not to be confused with 2.5mm, which is a little smaller and far less common than 3.5mm connectors. Or 1/4" connectors, which are slightly larger and are typically found on high end headphones and music equipment. The adapter will allow you to join two female stereo cables together. Or as a gender changer from Female to Male. The adapter is constructed with an all metal body for maximum durability. And is fully shielded to reduce electrical interference. The 3.5mm Stereo Male to 3.5mm Stereo Male Coupler Adapter is a quick and easy solution for your audio projects. If you still have any questions, you can call our customer service department at 888-519-9505. For all your cable and connector needs, choose Show Me Cables.