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双功能电话管理仪孙福全目前流行的电话锁一般都是采用收、解码原理的，其加锁功能也都是密码控制，因而存在成本高，安装、使用繁琐的缺点，现介绍一种应用自动发号原理的电话锁，它的锁控功能是通过电压鉴别实现的，而且还兼具线路防盗功能，加之成本低廉，因而非常适于...
Dual-function phone manager Sun Fuquan Currently popular phone locks are generally used to receive and decode principles, and its locking function is also password-controlled, so there is a high cost, installation, the use of cumbersome shortcomings are now introduced an application of automatic The principle of the phone number lock, its lock control function is achieved through voltage identification, but also both line security features, combined with low cost, so it is suitable for ...