md-300 handheld portable school factory bar security detector with high sensitivity

functions and features:
1. the utility model has the advantages of simple operation, exquisite design, convenient storage and low failure rate. 2. sensitivity makes it easy to detect metal objects the size of a pin (or even smaller). the sensitivity can be adjusted according to site requirements. 3. when metal is detected, it has sound (or vibration) and light alarm functions at the same time 4. working current: acoustooptic less than 56ma, vibration less than 90ma
5. overall dimension: 35 * 14 * 3 cm 6. net weight: 185g
7. package size: 48 * 32 * 47 cm.syi