Time and again, information of conference talk leaks to the outside which, in some cases, has devastating consequences. To prevent this, PKI has especially developed a note pad for the conference table for each participant with integrated electronics to detect cell phones and listening devices. At the beginning of the conference, this can be mentioned or a remark on the note pad indicates it. This should normally suffice to switch off cell phones or not to activate listening devices. Should this not be accepted despite the initial remark and should anyone act wrongfully, a red LED lamp on the note pad of each participant lights up. The participant in the conversation can be expelled from the conference and can be held responsible for it. The company director can switch on/off PKI 4255 Conference Phone and Bug Detector via remote control. So the participants cannot manipulate the PKI 4255 Conference Phone and Bug Detector.