Fanhai - Model DH9901E -Fire Telephone Extension

The DH9901E fire telephone extension with address is a two-wire fire telephone extension (hereinafter referred to as the extension). The extension is designed with non-polar wiring and built-in microprocessor, can operate together with a DH99E fire telephone host. In addition, the local address can be set by manual dialing with the dial switch. The host can be called by extension with off-hook operation, and communication is enabled by off-hook while the host is calling. The extension and the host can realize full-duplex communication, characterized by the simple and convenient operation, as well as clear communication.