While 2.5mm was the original standard for phone headsets, the slightly larger 3.5mm size is standard for music headphones and is now the more common size on phones. See: Headphone Jack (3.5mm ...

Using a female 2.5 mm stereo inline jack [octanechicken ... a shameless link to a previous featured article moving the headphone jack on a new Yamaha DGX-630 keyboard.

The 3.5mm headphone jack is an industry standard audio plug. Most commonly used for connecting a pair of stereo headphones to your smartphone or 'piping' your audio from your phone to an external ...

The analog socket used to plug in a headset, earphones or headphones. The 2.5 and 3.5mm jacks have been used on cellphones and smartphones, while stereo and home theater equipment generally have a ...