3.5 Male To 2.5 Female Adapter Silver Plated Copper Headphone Jack Conversi AM

2.5mm balanced plug to 3.5mm stereo interface. Product Plug: 3.5mm Female To 2.5mm Female. EXCELLENT SOUND QUALITY: The silver plated oxygen free copper wire core provides clear sound, and a protective layer is added to eliminate noise interference, allowing you to enjoy unparalleled HiFi sound quality and maintain the original sound quality of the headset.

eBay