Applications:
1. Electronic detection inspection at airports, railway stations and wharfs;
2. Security inspection of customs, public securities, frontier defense and safeguard authorities;
3. Quality inspection of medicine and food commercial systems;
4. Security inspection of important sites and playgrounds;
5. Noble metal detection, such as gold or silver jewelry manufacturing plants.

Feature:
1. Highly sensitive;
2. Simple and convenient to use, no adjustment is required;
3. The detection distance will not be changed when the battery voltage drops from 9V to about 7V;
4. Low power consumption, can work for 40 hours continuously;
5. There is automatic and continues alarm when the battery is used up;
6. Switch on/off audio prompt function;
7. With external rechargeable socket hole;
8. Has audio, light and vibration handoff switch.