Security material such as cloth, either normal strength or armored, or fragile webbing into which electronic micro-devices are woven to detect and react to tampering of the monitored article at the scene or via a network. The contact includes a body having a plurality of formations, each of the plurality of formations having a concavity and an opposing convexity positioned to generally face the die electrode. Presumably the other telephone will hang up. The active area of the grate is reduced by forming at least one inactive bed area that is out of use. The telemetry system may further include a transmitter having an encoder and a modulator.