The HOMESAFE WIRELESS HOME SECURITY SYSTEM is a cost effective solution to protect your home or office. This simple to operate system sounds an audible alarm and dial as many as five phone numbers of your choice to sound the alert. This system uses a combination of one motion sensor and one widor or door sensor, each of which transmit wirelessly to a main base unit. When an intruder is detected either of the sensors will sound an audible alarm and transmit a signal to the base unit. The base unit will then begin calling each of the phone numbers on the list until someone answers. When someone answers, they have the option to either listin in, or actually have their voice transmitted and broadcast from the built-in speaker in the base unit. If that doesn't scare off an intruder, then I don't know what will! Each system comes with one RF remote control for arming and disarming the system. Additional remotes may be ordered (HA-REMOTE).