... : underground metal detectorSpecifications: Power Supply 9VDC-6pcs AA size 1.5V BatteriesOperate Frequency 22KHz ± 2.2KHz Operating Current 45mA max at max ... :3.93" for a US(25cent)quarter with meterSensitivity Indication at min.discriminationDimension : 26.37"-35.43"(L) ×7.2"(W ... from Green Bar : 7-12V Color : Black With md-3005 metal detector, you can hunt for coins,relics,jewelry,goldand silver,etc ...