Your HIKVISION brand metal detector is ideal for use at airports, industrial sites, government buildings, schools, hospitals, meetings, athletic events, or anywhere you need additional security, and it can also be useful where it is not necessary. possible the use of a DETECT ARC or as additional support to it, its sensitivity to detect very small metallic objects is of great help and prevention of metal extraction and so it can be used for special applications, such as locating a security device. listen in a room. Our scanner emits a high-pitched tone or vibration every time it detects metal.