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A TRRS plug or Tip Ring Ring Sleeve plug has four contacts, which are sometimes referred to as poles. So a TRRS is a three ring four pole connector. TS = 3 Ring and 4 PoleThe additional contact pole on these connectors is for composite or digital video rather than a microphone. The remaining are your ground and the stereo audio. Ideally there would be a standard which included the tip always being left audio and the first pole for right audio. However, this is not the case. There are a number of wiring conventions, some with the tip being something other than left audio. The table below illustrates the Apple AV cable convention, which is consistent with their microphone headset convention.{| border="1" class="wikitable"|+ Apple iPod AV Cable|-| Tip| Left Audio|-| Ring| Right Audio|-| Ring| Ground|-| Sleeve| Video|}Many Camcorders (portable video cameras) use another convention. {| border="1" class="wikitable"|+ Camcorder|-| Tip| Left Audio|-| Ring| Video|-| Ring| Ground|-| Sleeve| Right Audio|}