PSTN alarm products adopt PSTN (Public Switched Telephone Network) information data transmission mode and voice platform to remote control & alarm. This kind of products could cover the security of family, store and office. PSTN are popular in the world now. So PSTN alarm products could extensive apply to security installation systems in same areas such as family, electric power, transport-ation, petroleum, coal, railroad, government, police station etc. Main Function 8 wireless guarding zones, 4 hardwire guarding zones. Remote monitor the noise of guarding space and query alarmed zone's name through phone. Support 6 user phone numbers, which dialed while host alarming. Support 13 working LED, quick, simple and clear. Support several of ways to set guarding zone: Emergency /Delay/Part. Send alarm data to alarm center system, while alarming. Inside-voice module can alarm and support operate voice directive. Equip 16 pressed-keys on host for self-program. Local arm/disarm with remote controller, the pressed-keys of the host or remote by phone. Self-defined ring times when the host be called. If the telephone line connected with the host be cut off, the host drives the alarm horn immediately. Equip standby rechargeable battery. While alarming, support dialog through phone network. (Option) Track the guarding zone from remote, while alarming. (New function) While alarming, play alert voice (pre-record) warn intruder. (Option)