The SA-5000 security messaging alarm system is suitable for use to monitor home, office, warehouse, school, shop, construction site, etc. This system will connect with a telephone line. The main unit will act as a control unit and also a desktop hand-free phone. The system comes with a wireless door sensor and a wireless PIR sensor. Once the system is in arm mode and detect intrusion, the main unit will call preset telephone number to notice the intrusion. The first one telephone number cannot be connected, then call the second one, etc, up to 8 telephone number. Further, user can call in the main unit to remote control such as arm/disarm, siren on/off, remote listening, and two-way voice communication. The system comes with a remote control for arm/disarm and also act as panic button.