3.5mm stereo female to 3.5mm stereo female coupler allows you to convert 3.5mm stereo male into 3.5mm stereo female. It is also used to connect two 3.5mm stereo cables together for extended length. 3.5mm Stereo Female to Female Coupler: Connect Two 3.5mm Stereo Cables Together or Convert 3.5mm Stereo Male to Female. The 3.5mm Stereo Female to Female Coupler is a versatile adapter that allows you to connect two 3.5mm stereo cables together or convert a 3.5mm stereo male connector to a 3.5mm stereo female connector. This adapter is easy to use and requires no additional tools or hardware. Simply plug your 3.5mm stereo cables into the two female connectors and you're ready to go. This coupler is compatible with a wide range of devices, including: Headphones, Speakers, Smartphones, Tablets, Laptops, Computers, Other portable audio devices