Ideal for sharing audio between two people. Attach the male pin to the music source and plug two sets of headphones into the two female connectors. Both people will then be able to hear the sound. Can also be used to route sound to two different sets of speakers. This quality adapter is commonly used to split the signal on a headphone output, such as in a recording studio, Hi-Fi or on a mixer/amplifier so 2 pairs of headphones can be used at the same time. Utilising the two converter plugs, either one or both outputs can be converted to 3.5mm. Cable colour: Black - Cable length: 20cm - Conductor: CCS - Copper Clad Steel - Plating: Nickel PLEASE NOTE: This adapter duplicates the sound so both outputs hear the same audio. It is stereo, not mono. Also, it does not split a stereo source into Left and Right channels. The plugs and outputs on the cable are the larger type, not the size you find on smartphones and other small music players. However, by using the included converter plugs, earphones with the smaller 3.5mm jack can also be attached.