Turns a 3.5mm combo headphone,microphone port into two distinct ports - one 35mm headphone jack and one 35mm microphone portCompatible with all mobile phones ,android handsets , tablets , laptops and any mobile devices with a combo headphone,mic jack (3.5mm jack)Allows the use of older audio accessories with newer laptops, tablets and smartphones having one 35mm jack portOvercomes the limitation of some laptop audio ports, by turning a single 4-position 35mm audio port into two distinct 3-position 35mm audio ports, allowing you to connect a microphone as well as external speakers