- It can be used for public security in airports、 railway stations、 docks、 prisons、 customs and frontier defense as well as quality control of medicine、 food and other commodities.<br />- With very low power consumption、 this detector can work for over 40 hours continuously<br />- Beep sound、 LED indicator or vibration when metal detected<br />- Control: circulation switch (ON、 OFF、 a sound of light or mode of vibration)<br />- Operating Frequency: 20KHz<br />- Adjustable sensitivity<br />- Operating power: 9V DC Battery (not included)<br />- Low battery alarm                                                                                                                                Dimensions: 16.53 in x 5.43 in x 1.61 in<br />Weight: 14.74 oz