display device of conventional design likewise in accordance with the preferred embodiment of the invention programmable digital logic 102 is a personal computer indicators 106 120 include numerals 122 which identify the transducer with which they are associated likewise in the event that there is an indication of an alarm condition a display 125 indicates the location of the alarm condition the same may also be accompanied by an audible alarm the amplitude of signal detection is shown by conventional bar graph indicator segments 124 which may have low or normal values as illustrated in four example indicator 106 or high values as indicated by indicator 118 in addition color coding may be used for example indicator segments 124 may be green during normal operation amber to signify a heightened alert condition and red to indicate a dangerous condition in accordance with the invention it is contemplated that different audible cues will be associated with different levels of alert for example an amber heightened alert may be indicated by a beep while a red dangerous condition may be indicated by a repetitive siren like sound in accordance with the invention it is contemplated that individual transmitters will be associated with a particular body part or portion of the face for example this may be done.