... , Built-in artificial intelligent English message for alarm system 10, Can support all kinds of wireless sensors, such as PIR detectors, door ( ... is on, will also alertTechnical parameter for the gsm alarm system wireless:Operating voltage: Input 100-250V, output 12V. Wireless ... Frequency: 433 MHZ, 850/900/1800/1900MHZStandard kits of the gsm alarm system: a main panel, a wireless PIR detector, a ...