That approach will eliminate most cord-cutting concerns—but what about their wireless equivalent, jamming? With the right device tuned to the right frequency, what's to stop a thief from jamming your setup and blocking that alert signal from ever reaching the base station?Jamming concerns are nothing new, and they're not unique to security systems.
出自-2016年12月閱讀原文
And if a singer coughs, this can result in the bruising of the vocal cords.
出自-2013年6月聽力原文
They are easily-available on the continent and they are useful if a singer has problems with his vocal cords and has to sing that night