A Cat5e FTP Keystone Coupler is a connector used to join two Cat5e FTP (Foil Twisted Pair) cables together. It is specifically designed to provide a reliable and secure connection in networking applications. The FTP (Foil Twisted Pair) shielding helps to minimize electromagnetic interference, ensuring a stable and high-quality data transfer. The Keystone design allows for easy installation and integration into various wall plates, patch panels, or keystone jacks.