SPECIFICATIONS
         Size:
                  Length overall = 165 mm
                  Body diameter = 40 mm
                  Probe end diameter = 13 mm

        

         Mass:
                  350 grams
         Battery Life:
                  The integral battery is expected to give more than 20 years operation and does not require replacing.
         Working Distance:
                  1 meter to 4 metres from expected path of the walkers.
         Maximum Counts:
                  Six digits giving a maximum count of 999,999.
         Detecting method:
                  Passive infrared  (radiant temperature).
         Construction:
                  Milled aluminium.