Door Frame Metal Detector -TT12 (Multi Zone Security Model) Construction:PVC composite material through special production process. Technology : Digital/ analogy and left right balance of signal prevents false omitted alarm. Sensitivity:99 levels for each detecting zone Circuit :Auto calibration and diagnostics Detection of Ferrous/Non Ferrous Ferrite Alloy Protection :Password protected; Counter :Traffic counter and alarm counter Display : Back lit LCD with time control Power supply Inbuilt SMPS 90-270Vac Controls : Front panel / Remote control