4690型多功能电话机除有5600型等电话机的优点和功能外，还增加了主人16s固态录音芯片，座机环境声音监听功能等。本文对该机作一简单介绍。无绳通信部分它和5600、5630、5650型一样均采用10对频率自动及手动切换装置，当遇同频干扰时，可自动或手动切换到其他空闲频道，从而提 4690-type multi-function telephone in addition to 5600-type telephone and other advantages and functions, but also increased the host 16s solid-state recording chip, landline ambient sound monitoring capabilities. This article makes a brief introduction of this machine. Cordless part of the 5600,5630,5650 type, it uses the same type of 10 pairs of automatic and manual switching frequency, in case of co-channel interference, can be automatically or manually switch to other free channels, which mention