*diagram reflects B.O.S.S. II (5-zone) model
The screening procedure is safe, quick, and reliable. The target being screened simply positions his / her chin near the oral sensor and then sits momentarily in the chair. The entire process takes just a few seconds.
Magnetic field sensors housed in the seat of the chair and the oral sensor assembly automatically interrogate for the presence of metal objects. Audio and visual alarms are activated when metal is carried into the magnetic field. An alarm remains activated for the duration that a metal object is within the low-intensity magnetic field.