Specification:100% Brand New,quality is very hight2.5mm plug to 3.5mm Jack AdapterConverts Smaller 2.5mm Mini-Plug Headset or Headphone Devices for use with larger 3.5mm Receiving DevicesWill Change some MP3, MP4 and CD Players to accept a 2.5mm Headset or Headphones.Package include:2pcs stereo audio mic plug adapter