RuiLing 2PCS Headphone Converter Adapter Gold Plated 2.5mm Male Right Angle to 3.5mm Female Socket Jack Stereo Audio Cable. Gold-plated connectors 2.5mm male to 3.5mm female audio adapter cable. Easy connection, just plug it into your PDA phone and connect with your standard 3.5mm headphone Allows you to connect any 3.5mm stereo headset and portable speaker with smaller 2.5 mm output devices, such as cell phone, PDA, radio or MP3, etc. This adaptor enable your headset to use a standard earphone jack to get full stereo sound from. 3.5 mm output means unlimited possibilities of device to broadcast the audio sound / music from your phone