1.Low failure rate, 2. It can detect ferrous metal and non-ferrous metal 3.High sensitivity, 4.It detect ferrous metal and Technical specificationsOperating frequency: 20 KHzUnit Weight: 272g (including the battery)Handle Dimension: 30 X30mmUnit Dimension: 440(L) X 55(W) X 145(H) mmCarton Dimension: 460(L) X 305(W) X 582(H) mmSensitivity Adjustable: manualIndicator: BZ, vibration motorBattery: a ...