a fence module is adapted for installation without required anchoring buy providing a base frame and a plurality of upright supporting posts extending from the base frame . at least three fence sections extend between the supporting posts . a first fence section at a first extreme end of the fence module , a second fence section at a second extreme end of the fence module , and a third fence section angularly positioned between the first and second fence sections . a pair of vibration sensing modules are used to detect intruders , one applied to the first fence section and a second applied to the third fence section , with the first fence section positioned on the secure end of the protected zone .