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        Product
        GSM&Network Module
        SK-138GSM Wireless Dialer
        • Function Features
        • Technical Reference
        • Schematic Diagram
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        ◆ 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
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