FUNCTION: 3.5mm audio splitter Y extension cable 20cm connects most devices with 3.5mm auxiliary port (AUX), like MP3 player, smartphone, tablet, computer etc, to two headphones or speakers, which is more→a great solution to share cool music, movies and games with your families and friends Important Notes: If you use TRRS headphones (4-conductor) with this extension cable, the audio will work but the Mic won't.It also does NOT work with the inline volume control on the headphone. Interface Type :3.5mm male,3.mm female Connector:Gold-plated Conductor: Enamelled copper Jacket: TPE Packing: PE bag