SICOHOME 2.5mm Male to 3.5mm Female 3 rings Jack Stereo Adapter On/Off enabled,Black(Pleas Pay Attention to the Model of your Application) Type: Brand new 2.5mm male to 3.5mm female adapter,Perfect for listening to MP3s with your own earphones,speakers etc. Use your Phone or smartphone headset with any 2.5mm home, office, or mobile phone headset Adaptor converts the phone's own audio output into a universal 3.5 mm output For audio / muisc output ONLY,audio input not available.And 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