The XLR cable is used for professional audio, video, and stage lighting equipment. They are most commonly associated with balanced audio interconnection, including AES3 digital audio, but are also used for lighting control, low-voltage power supplies, and other applications. They are superficially similar to the smaller DIN connector range, but are not physically compatible with them.
This XLR cable has three pins and a circular connector. XLR cables are used to deliver balanced microphone and line-level signals over long distances, so an XLR cable can be simply thought of as a microphone cable. An XLR cable’s ability to deliver a balanced signal means that the final audio signal will have less unwanted noise from outside electrical interference. This preserves the original audio signal, even over long distances and near other electronic devices.
Does it come in different lengths? Yes. Usually in 10′ or 20′.
Technical Specifications of the ITEM here.
Link to Manuals: pdf or Online
Useful resources out on the web, you-tube, or Lynda.com that make sense for this item.