... ) is adopt MCU and auto code. The repeaters can be used in school, hotel, shop, storeho Product DescriptionDescription: Wireless alarm Repeaters ... MCU and auto code. When received detector zone signal, the repeater transmit the signal to alarm main unit. Expend the alarm ... with alarm main unit and detector. The repeaters can be used in school, hotel, shop, storehouse and so on. Specification: Power ...