SmartKeeper Essential 1x network module lock 4P. Module Lock physically secures 4x LAN cables to Ethernet (RJ-45) ports (1 row of 4) to prevent unauthorised access to the port via unplugging the cables. Plugs into the RJ45 port to block when not in use and prevent unauthorised access. Can only be unlocked with the corresponding colour-coded Lock Key Basic (U03). Effective first-level protection - including against: