Electop 2.5mm Male to 3.5mm(1/8 inch) Female Stereo Audio Jack Adapter Cable for Headphone Features: 2.5mm Male to 3.5mm Female Adapter; 2.5mm Male with 2 black rings, Without MIC function. Length17cm; Function: Let you use 3.5mm Headphone on 2.5mm devices. Perfect for listening to MP3s with universal 3.5mm earphones, speakers, etc. Note: For audio/muisc output ONLY, audio input is NOT available(CANNOT be used to communicate). Many cell phones do not use a standard headset jack and you are forced to use their original earphones. Reduce Electromagnetic Radiation (EMR) caused by cell phones and bluetooth headsets. Clean natural pure audio sound with realism and clarity jitter-free stereo format signals. <span class="a-text-bold">Features</span>: 2.5mm Male to 3.5mm Female Adapter; 2.5mm Male with 2 black rings, Without MIC function. Length17cm; <span class="a-text-bold">Reduce Electromagnetic</span> Radiation (EMR) caused by cell phones and bluetooth headsets. Clean natural pure audio sound with realism and clarity jitter-free stereo format signals.