Please note: This splitter can not support external mic,Please email us before you make purchase if you are not sure about compatibility of your device with this 3.5mm splitter so we can help you to choose right model for your device. Note: While using this headphone splitter with PC applications; make sure that you have selected Microphone and Headphones options in Audio settings of the application. 3.5mm audio port into two distinct 3-position 3.5mm audio ports, allowing you to connect a microphone as well as external speakersThis allows you to use your own high quality Hi-Fi headphone and Hi-Fi Microphone to all mobiles and tablets. mic port is not for record voice, it just for voice outgoing. Also External Mic does not support. Compatible 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 3.5mm jack port. 3.5mm (4 Position-TRRS) Male Plug,2* 3.5mm (3 Position-TRS) Female Jacks (1 for Mic, 1 for Headset) Please Note: This splitter works with only 1 input for audio and mic on your laptop it doesn’t work with two separate inputs mic and speaker. Overcomes the limitation of some laptop audio ports, by turning a single 4-position.