Teach you how to identify contraband from the color:
The display shows a blue tint, can be judged as metal materials. Such as daggers, knives, etc.
The display shows a green tone, you can judge for explosive substances. Such as firecrackers, firecrackers, etc.
The display shows an orange tone, you can judge for liquid items. Such as mineral water, lighters and related organic substances. The picture is as follows: