ELEGIANT Replacement Audio Extension Cable Cord for BOSE QC15 Headphones It can extent your original cable for about 1.80m which makes you act more flexibly and freely in your room, car and other places and spaces with your headphone. You can use it as a spare or replacement in case that your original cable is lost or damaged. You can use it to connect any device with diameter 3.5mm to listen to music. It has 2 types of ports, 3.5mm 4 pole male stereo plug and 3.5mm 3 pole male stereo plug. A switch is for you to adjust the volume,low or high.