目前电话机作为一种方便快捷的通讯工具,已在现代家庭中相当普及,如果我们对现有电话机稍加改制,添加几个关键性的开关元件,那么电话机既可打电话又可兼作自动防盗报警,经营者可利用这一技术上门服务或对传统的电话机改制出售,只要宣传、引导得当,肯定会有利可 At present, the telephone as a convenient and quick communication tool has become quite popular in the modern family. If we slightly modify the existing telephone and add several key switching elements, then the telephone can both call and doubly as a Automatic anti-theft alarm, operators can use this on-site service or the restructuring of the traditional telephone sales, as long as publicity and guidance properly, will certainly be profitable