... >315 MHz or 433MHz Frequenc gsm module home alarm system with Auto PIR Sensor 315/433Mhz Frquency 10 Wireless Zone ... magnetic sensor and other top technology. When the system detects someone intrusion, the siren will ring at ... once. Meanwhile, the system will send SMS first then auto-dial 5 phone ... of anti-fire and anti-leak gas. The system can used for villages, houses, shops, smal ...