Generic 3.5MM Jack to 2.5MM Plug Stereo Headset Adapter [Electronics] Attach 3.5mm headphones or speakers to audio devices with a 2.5mm stereo audio port. Does not include fourth band for microphone. Connector 1:?.5mm stereo audio male (3 band). Connector 2:?.5mm stereo audio female (3 band). Length:?".