A low voltage, low power versatile and compact delay circuit for CMOS integrated circuits. The mat includes first mounting structure and a first sensor device attached to the mat. The pressure responsive central portion of each laterally elongate panel is a smooth outwardly projecting dome from a peripheral root of a generally radially projecting wall defining the margins of circumferential rings and posts separating the panels. The tracking device has at least two operational modes and switches between these modes when communication is established between the tracking device and the auxiliary device so long as one or more predetermined conditions are satisfied. Moreover, the item can be rotated with respect to the body so as to adjust its facing direction.