Product features Detection area: the door frame metal detector is divided into six overlapped detection areas according to ergonomics. Alarm method:the product with sound and light alarm and the led alarm light on both sides of the stand column can accurately detect the area of the metal. The detection sensitivity:the highest sensitivity can detect metal objects in size of a coin. The sensitivity can be adjusted freely from 0 to 99 degree. And each detection area can be adjusted to an appropriate sensitivity as per detection requirements. Know more details, please visit our website:http://www.Ty-security.Com/walk-through-detector/