-SA5000 is suitable for use to monitor home, office, warehouse, school, shop, construction site, etc. It is 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, up to 8 number. User can call in to remote control such as arm/disarm, siren on/off, remote listening, and two-way voice communication.