... zone >GSM900/ DCS1800MHz >315 MHz or 433MHz Frequenc wireless alarm system gsm with Auto PIR Sensor 315/433Mhz Frquency 10 Wireless ... PIR sensor, magnetic sensor and other top technology. When the system detects someone intrusion, the siren will ring at once. Meanwhile ... has the function of anti-fire and anti-leak gas. The system can used for villages, houses, shops, smal and medium stores, cars ...