Amazon.com: Adhiper Replacement 2.5mm to 3.5mm Stereo Jack Cable Adapter,for Headphone, Tablets, 4 Poles Jack Stereo Adapter for Stereo Audio Jack Adapter Cable,2.5mm to 3.5mm Adapter (2 Pack) : Electronics
Gold 3.5mm Male to 2.5mm Female Stereo Audio Headphone Jack Adapter Converter a | eBay
3.5mm Male to 2.5mm Female Audio Adapter - from LINDY UK