Cập nhật : 02/05/2012 2:13:25 CH
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Thông số kỹ thuật
◆Real-time monitoring PSTN telephone line states , when the telephone lines cut or when accidents occurred , dialers automatically and immediately switch to GSM mode to replace the telephone lines , which is responsible for communications and send alarm information
◆Real-time monitoring GSM network states , when the GSM network is abnormal , dialers automatically and immediately switch to the PSTN telephone line model to replace the GSM , which is responsible for communications and send alarm information
◆Easy to install and set , no need to program and debug . SIM card installed no need to disconnect the cover when install SIM card
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