The 15 cm 4-pin 3.5 mm male to dual 3.5 mm female adapter is the perfect solution for connecting a set of headphones and a microphone to a single 4-pin 3.5 mm 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 3.5 mm audio port capable of supporting both an audio input and an audio output. This adapter provides two separate 3.5 mm ports that will support a mono microphone and a set of stereo headphones or a set of external speakers. The compact design of this adapter makes it easy to carry in a laptop bag or briefcase.