3.5mm Stereo Male to Dual X 1/4" 1/4 Inch 6.3mm Male Mono Plugs Y 3.ft. Cable Audio Connecting between 3.5mm. stereo and 1/4in. (6.3mm.) mono connection types Connecting speakers to portable audio devices, computer sound cards, and more Connecting headphone to amplifiers and other home theater devices Connecting two different speakers to a single stereo audio source