It can detect tiny nonferrous metals or ferrous metals. Product description: With its extremely high sensitivity, it can detect very tiny non-ferrous metals or ferrous metals, including gold, silver, copper and aluminums, etc. It is suitable for factories of all size and safe-exam department to inspect people. 》 》 》 》 》 》 power: 9V(6F22) working frequency: 22KHz working currency: working voltage: 7V-9V indicator: Visual: Red / Green LED ; Sound: Speaker or Earphone; (Earphone not included) control: On/Off Switch; Low sensitivity Switch Sensitivity Adjuster high sensitivity: 15mm at Pin; 45mm at USD 25 Cent low sensitivity:Detector only respond to bigger metal export packing: objects such as a hand gun, knife, etc. 25 Pieces Per Carton 0.089CBM N. W 10.3KG ; G. W 16.5KG size: 41(L) X 8.5(W) X 4.5(H) cm gross weight:409G color: black attachment:leather bag tional: chargeable battery