本发明仅需在现有手机上增设光敏接收窗和光敏感应电路，软件上增添防盗模块的设计，成本低廉，使用方便。
The invention is only need to add light sensitive reception window and light sensitive induced circuit, and add module of guarding against theft to software.
同直流信号直接耦合处理相比，交流信号耦合虽然要增设调制解调装置，但对后级信号处理电路的器件要求更低，信噪比更高。
Compared with DC coupling signal processing, it need lower requirement of signal processing circuit and have the merit of high signal-to-noise performance although it require the device of modem.
克服了传统数字电路倍增设备只能点对(多)点传输的局限，可方便的组成EDCM网。
The limitation of traditional DCME (only point to (multi -) point transmission) is overcome by the new one. EDCM network can be easily formed.
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