Overview the 15cm 4 pin 35mm male to dual 35mm female adapter is the perfect solution for connecting a set of headphones and a microphone to a single 4 pin 35mm port on a laptop tablet mobile phone or other mobile device newer laptops mobile phones and other mobile devices only offer a single 4 pin 35mm audio port capable of supporting both an audio input and an audio output this adapter provides two separate 35mm ports that will support a mono microphone and a set of stereo headphone