winloop gold plated 3.5mm female jack to 2.5mm male jack stereo full metal earphone audio headphone headset adapter connector converter 2.5mm to 3.5mm 3 ring jack stereo or mono (2 pack) winloop interface process: gold plated<br> type: 3.5mm female to 2.5mm male adapter<br> shell material: aluminum<br> shell process: electroplate<br><br> 2.5mm male to 3.5mm female features.<br> audio jack adapter that extends the reach of most 3.5mm cables / plugs through thick pockets for mobile devices, iphone,ipod, mp3 players, cd players, smartphones, tablets, or an audio device with a 3.5mm headphone jack to the headset with microphone, credit card - close reader, car, office or home audio system.<br><br> <b>note:</b><br>this adapter compatible for all type of no mic function earphone. if your earphone/headphone with mic function,please check it is ctia standard jack or omtp standard jack, as this adapter only suit for ctia standard jack earphone but not compatible for the omtp standard jack earphone<br><br>the difference of ctia standard jack or omtp standard jack earphone/headphone: <br> 1.the 4 poles connection sequence of ctia standard jack earphone is : left channel, right channel, earth wire, mic<br> 2.the 4 poles connection sequence of omtp standard jack earphone is: left channel, right channel, mic, earth wire<br> so please double check the standard of your earphone/headphone is ctia standard jack or omtp standard jack before purchase this adapter. of course, if your earphone with no mic function, then no worries, it will suit well.<br>