Emergency phone users can communicate directly with the operator of the emergency phone console and talk by key (easy to operate).
Highway tunnel monitoring project, emergency telephone wired broadcasting system is a special communication system for providing emergency rescue for drivers on the road in the event of a traffic accident.
The broadcast amplifier is set with over-voltage and under-voltage protection. After the device is turned on, it should automatically monitor the voltage.
Shenzhen Lidian Golden Century Technology Co., Ltd. is a high-tech company specializing in the research and development, production, sales and after-sales service of optical and electrical communication products.