... 6F22ND 9V battery 3.Net weight: 350g MD300 Handheld Portable Metal Detector / ScannerFeatures:1, simple operation, compact design, easy to save ... less), metal items. Requirements under the regulation of the sensitivity of the scene. 3, have the battery undervoltage instructions (LED ... / box, 7.4 kg / box)MD300 Handheld Portable Metal Detector / Scanner MD300 Handheld Portable Metal Detector / Scanner