... the Checkgate Walkthrough PD6500i provides superior detection,uniformity and performance.5,Advanced Broadband Detection Technology provides superior ... prisons,schols,facilities,special events,mass transit,lossprevention and many other applications.8,Optional Accessories provide ... IECStandard.4,Multi-Unit and Multi-Brand Compatability:2,300 selectable frequencies and multiple channels allow the PD 6500i ...