electronic nuisance

Have you ever been kept awake by a cricket? You switch off the light and snuggle down, and just as you`re drifting off to sleep the insect starts to make an irritating noise. As soon as you switch on the light to look for it, it stops again. Tracking down this type of noisy nocturnal nuisance can be infuriatingly time-consuming. The same result can be obtained electronically. What`s the point? Well, just for the fun of it.