HONGKONG KOON Technology LTD exported EMERGENCY TELEPHONE to Iran in October 2019. Project name used for installation: Alburz Tunnel, Tehran-Shomal freeway. Product model: KNZD-13 IP, phone self-checking system model TSS-1000, power amplifier model: KNMK-650, speaker model: L4. System superiority: the whole system has a self-checking function, and you can check every system in the monitoring room. The health status of a component reduces inspection costs and maintenance costs. Ensure that the system works normally 24X7. This system seamlessly connects with other systems. The high stability of this system is well received by the owners.