Our RJ-MOD is an economiser cable adaptor that carries two connections over a single port and outputs the same two connections to different locations. This is the perfect solution to adding extra ports to your wall sockets. The RJ-MOD only works in pairs and only if they are connected to the same port number. The RJ-MOD is designed for use on data networks only. Specification: Allows two CAT5e connections to share one CAT5e port. 21cm lead. unshielded. For data networks.