This innocuous looking box when attached to your phone is an innovative gizmo which can monitor the other party’s conversations. Say you are talking to somebody on the phone, but want to know what he is discussing with other people in the room. If the gadget is attached to your phone, you put the person on hold. This hold is not real, but the person thinks it is. (more…)

Those working in business sometimes worry their phone may be bugged because someone wants to hear what they are saying in order to steal information if they are a competitor, for example.

The practice of phone bugging is something the police employ quite regularly, but of course, in their case the bugging is done legitimately as they may wish top keep tabs on someone in a case they are following without their knowledge. (more…)

People may want to keep record of incoming and outgoing calls for one reason or another. It might be for business or even as a security measure.

This device known as Teleport 2 can generate a log of all your calls and record it on your PC. Furthermore, it also records the actual calls in audio form. So anytime you need to refer back to any of the calls for any good reason, you can simply play back the audio of the call and hear at your leisure. (more…)

This telephone number logger highlights a very different aspect of surveillance. Rather than listening to the calls themselves, this very small devices will log up to 2000 incoming and outgoing telephone numbers. The incoming telephone numbers are only recorded if a Caller ID service is available on the telephone line. (more…)

While looking around on MAKE Magazine, I found a useful little circuit for a telephone bug. I know how much you guys love circuit diagrams! (more…)

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In a recent article, I discussed the difference between parallel and series telephone taps. In this article, I present a very simple and reliable parallel phone tap circuit useful for recording telephone conversations onto a tape recorder. (more…)

This is the first of a technical series of articles relating to surveillance equipment. In this article, I’m going to talk about the 2 main types of telephone taps and where they should be located to be effective for monitoring telephone conversations. (more…)