CESS 3.5mm Male to 2.5mm Female Mono Audio Headphone Jack Adapter - 3.5mm Mono Male to 2.5mm Female (10 Pack) 3.5mm Mono Plug to 2.5mm Mono Jack Adapter 3.5mm Male to 2.5mm Female Can be use 2.5mm Mono Plug Work to 3.5mm Mono Jack & Socket Gold-plating resists corrosion and ensures minimal signal loss