JCD 2PCS Aux Cable Converter 3.5mm to 2.5mm / 2.5mm to 3.5mm Audio Adapter Stereo Headphone Amplifier Microphone Jack

2PCS Aux Cable Converter 3.5mm to 2.5mm /2.5 mm to 3.5 mm Audio Adapter Stereo Headphone Amplifier Microphone JackA: 3.5mm interface headphones are not suitable for use with a balance head. It is not a universal adapter, but only for converting audio heads.B: 2.5mm interface headphones are not suitable for use with a balance head. This adapter does not change the wiring method. The wiring sequence for 2.5mm headphones is mostly in accordance with national standards, while most 3.5mm phones are in accordance with American standards. So it may take two conversions together to work properly, one conversion standard and one conversion interface size,A: 3.5 female to 2.5 male four section audio adapter, not compatible with American and Chinese standard interconversion, converted to the same standard as the original headphonesB: 2.5 female to 3.5 male four section audio adapter, not compatible with American and Chinese standard interconversion, converted to the same standard as the original headphones