This connector can be also be used with certain other types of accessories ... and is now the more common size on phones. See: Headphone Jack (3.5mm) 2.5mm connectors are still common for TTY ...

Two types of connector co-exist in the Headphone jack world: the TRRS and TRS. The TRS connector is only used for listening while the TRRS connector is used to listen and speak thanks to an additional ...

Using a female 2.5 mm stereo inline jack [octanechicken] was able to get the Xbox One headset controller to work with older Xbox 360 chat headsets having a male 2.5 mm plug. The photos on the ...