Abstract: A product container having a wall defining a receptacle for a product, and first structure on the wall changeable from a first state to a second state as an incident of the first structure being heated above a first predetermined temperature. The first structure is changeable from the second state to the first state as an incident of the first structure being cooled below a second predetermined temperature below the first predetermined temperature. The first structure remains in the first state with the first structure in a temperature range including temperatures above the second predetermined temperature.

Abstract: A security system includes a pressure sensing circuit for generating an electrical signal in response to changes in pressure and a signal processing circuit, connected to receive the electrical signal, for determining whether the electrical signal represents an intrusion pattern. A pressure sensing circuit generates an electrical signal in response to changes in pressure and a trigger circuit for determining whether an intrusion has occurred by determining whether a peak of the electrical signal has an amplitude that exceeds a floating amplitude threshold, wherein the floating amplitude threshold compensates for ambient noise in the enclosed area. A monitor mode measures intrusion data in a specific enclosed area and determines security system thresholds in accordance with the measured intrusion data.