SmartKeeper RJ45 port block seals RJ45 type openings from unauthorized access, protecting connections from dust, debris and foreign objects Increased protection is ideal for public places, schools, military facilities, or anywhere network security and protection is easily compromised. It also reduces the time and cost of wasted downtime associated with data security compromise, hardware replacement, and infrastructure repairs. Simple push in installation. When removing, you need to use the master key to unlock the unique mechanism.