The Tele Safe II. Attach this to your home telephone system and it will either detect if a phone tap is attached to your line or an extension is picked up somewhere else in the house and automatically mute the sound. You have to wonder whether the divorce rate would plummet if these were in more widespread use around the world. But would that be a good thing…? $195.00.

 When a telephone tap is detected or an extension is picked up, the Tele Safe II engages automatic muting, protecting your privacy. In addition, the RF detection mode may discover the presence of wireless microphones within inches of the ant. Tele Safe II scans frequencies from 5MHz to 2 GHz and features adjustable sensitivity.