FS30 RRU is a very useful accessory for customers who need higher security when using Futronic Fingerprint Access Control System FS2x series(FS20, FS21M/FS22). The FS30 can be put somewhere inside the facility. When access to this facility is granted to someone by FS2x which is installed outside the facility, instead of FS2x controls the electric door lock to open the door, a signal is sent from FS2x to FS30 which will then open the door. This eliminates the possibility of manipulating the connection between FS2x and electric door lock to make unauthorized access to a secured facility.