PC Headphone To SmartPhone Adapter 3.5mm 2 Female To 3.5mm Male Splitter Cable. 1pcs 3.5mm 1/8" Stereo Audio Headphone Y Splitter Adapter Cable for Mp3 MP4 28cm. This cable can be used to connect two devices with 3.5mm stereo jacks, such as computer sound cards, speakers, CD players, MP3 players etc.
eBay