<P> A phone connector, also known as phone jack, audio jack, headphone jack or jack plug, is a family of electrical connector typically used for analog signals . The phone connector was invented for use in telephone switchboards in the 19th century and is still widely used . </P> <P> It is cylindrical in shape, with a grooved tip to retain it . In its original audio configuration . It typically has two, three, four and, occasionally, five contacts . Three - contact versions are known as TRS connectors, where T stands for "tip", R stands for "ring" and S stands for "sleeve". Ring contacts are typically the same diameter as the sleeve, the long shank . Similarly, two -, four - and five - contact versions are called TS, TRRS and TRRRS connectors respectively . The outside diameter of the "sleeve" conductor is 1 ⁄ 4 inch (6.35 millimetres). The "mini" connector has a diameter of 3.5 mm (0.14 in) and the "sub-mini" connector has a diameter of 2.5 mm (0.098 in). </P> <P> In the USA and UK, the "jack plug" is called simply a "plug", whereas in other languages, such as Czech, it might be called simply a "jack". In English, the mating socket is called a "jack". </P>

What is a 1 4 inch trs connector
find me the text answering this question