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The audio jack that is commonly seen on stereo headphones, audio devices such as a Sony Walkman, and some cell phones is known as the TRS Connector. The TRS phono plug connector is an audio jack with either 2 or 3 rings. TRS is an acronym representing Tip + Ring + Sleeve. The 2 contact (Tip + Sleeve or TS) version is for mono audio and the three contact version (TRS) is for stereo audio. There are also other variants such as a four ring version which is often designed for camcorders, the extra ring for the video signal, or for modern cell phones and mobile devices facilitating earphone and microphone combination headsets.This audio jack is commonly seen on stereo headphones for audio devices such as a Sony Walkman, and some cell phones, although there is a wide range of uses including audio input as well as output. The TRS phono plug connector is an audio jack with 3 contact places on the jack separated by two insulation layers. TRS is an acronym representing '''T'''ip + '''R'''ing + '''S'''leeve. The 2 contact (Tip + Sleeve or TS) version is typically for mono audio and the three contact version (TRS) is typically for stereo audio. There are also other variants such as a four contact version which is often designed for camcorders, the extra ring for the video signal, or for modern cell phones and mobile devices facilitating earphone and microphone combination headsets. Again, these are common uses, with audio being the most widely implemented application. A TS plug or Tip Sleeve plug has two contacts, which are sometimes referred to as poles. So a TS is a one ring two pole connector. TS = 1 Ring and 2 Pole A TRS plug or Tip Ring Sleeve plug has three poles. So a TRS is a two ring three pole connector. TRS = 2 Ring and 3 Pole There is a standard accepted in the industry for audio devices.[[Image:tipringsleeveaudioleftright.jpg]]:3. Sub-Mini Thirty-Second (3/32) - standard for mobile phone audio connector, however, eight is become more common on newer models.:3. Sub-Mini Thirty-Second (3/32) - standard for mobile phone audio connector, however, 1/8 is become more common on newer models.