Xandem Technology detects and locates people who are not carrying a tag or device. This powerful and cost-effective technology can detect people through walls, obstructions and in other difficult environments. Xandem surrounds areas with small, inexpensive and low-power wireless transceivers. The devices communicate with one another to form a dense web of radio waves that blanket the area. When people enter the area, their bodies disturb the radio field and Xandem technology detects and locates them.