◆ Can match any brand of user terminal equipment such as alarm panel , telephone , SPC exchanges , and so on . Upgrade the single PSTN network to GSM & PSTN Dual Network
◆ 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
◆ Small and beautiful appearance , the work states indicator is easy to understand