[Headphone Audio Adapter] - Brand New 3.5mm M to 2.5mm F audio adapter convert 2.5mm audio. 2.5mm M to 3.5mm F audio adapter convert 3.5mm audio. Headphone audio adapter provides stereo/mono functions to convert 2.5mm/3.5mm audio, convert your electronic devices, help you easily conver the audio. [4-pole 3 Ring Plug Adapter] - 3.5mm male to 2.5mm female/2.5mm male to 3.5mm female audio adapter converter adopts electroplating process, aluminum case, anti- scratching more durable, anti-oxidant corrosion resistance. Gold-plated interface make sure effectively reduce the loss of signal. [Plug and Play] - Sound quality fidelity transmission, plug and play, easy to use, The slim design makes this the best style to use, there are no extra cable cords or odd angles, 360 degree grip treads help easy plugging and unplugging, mini size and portable. [Application] - Connect your iPhone, iPod, MP3 player, CD player, smartphone, tablet or any audio device with a 3.5mm/2.5mm headphone jack to your headset with microphone. Widely work with headphone, home audio equipment, amplifiers, mixing console, home theater devices or AV receivers. [Package Contents] - 1pc 3.5mm male to 2.5mm female headphone audio adapter + 1pcs 2.5mm male to 3.5mm female headphone audio adapter.