Fence Defence for construction site security

So it seems that 75% of theft from residential and commercial building sites occurs at night or on weekends. The system presented here goes beyond fencing:

Additional zone boxes can be purchased to monitor inputs other than fencing, these include temporary house alarms; smoke detectors; site plant alarms; tilt alarms; and laser trip wire. For added protection each zone box incorporates an anti-tamper mechanism that guards against unauthorized interference.

These are the same people who sell the system that drives teenagers away with the 18-20kHz that only they can hear.