|Klinkenstecker||phone connector, |
A plug for transmitting low voltage. Often used for audio or video connections. The plug contains a contact spring which can wear out with time. Thus, plugs can get loose (slack joint), and transmission quality can decline.
For audio devices and musical instruments, 1/4 inch (6.35 mm) is standard (mostly mono), for headphones 3.5 mm (mostly stereo).