如果有人在电话外线上并接话机或盗用您的电话线路打长途电话,将给您带来经济损失。HY3030型长途电话防盗保密装置可以防止他人盗用电话线路,同时还具有同线分机电话问互相保密的作用,其原理如图1所示。当用户分机中的一部话机打电话时,经自锁隔离单 If someone is on the phone and pick up or take advantage of your phone line long distance calls, will bring you economic losses. HY3030-type long-distance telephone anti-theft security device can prevent others from stolen telephone lines, but also has the same extension telephone calls asking each other the role of confidentiality, the principle shown in Figure 1. When a user in the extension phone call, isolated by a single lock