MD4030 Underground Metal Detectors Detection Instrument Product Features: 1. Two operation modes: all-metal mode, recognition mode 2. Volume Adjustment: Adjust the volume of speakers and headphones 3. Earphone interface: can be connected to the headset (not provided) to use 4. Pointer display: the pointer will swing with the discovery of metal 5. Waterproof Detector Plate: allows you to use the metal detector in shallow water. 6. Adjustable lever: adjust the length of the metal detector 7. Application: searching for buried metal objects, widely used in security checks, outdoor treasure hunting, metal checking and so on. Specification parameters: 1. Power supply: 2 x 9V (6F22) 2. Frequency: 5.0 KHz 3. Voltage: 7.2-9.6V 4. Current: static: 10mA; up to 70mA 5. Detector plate diameter: 6.5 inch 6. Measuring range: 1-30 cm 7. Expansion length: 30.7-42.1 inch 8. Sensitivity: US 25 Cent: 130mm 9. Alarm mode: audible alarm 10. Display mode: mechanical pointer mode 11. Detection of metal size: the larger the metal the deeper the detection 12. Scope of application: searching for missing metal Children's exploration 13. Weight: about 1200 g 14. Overall size: about 55 x 23 x 12 cm