Hand Held Metal Detector with LED Lamp

Technical Specifications
Operating frequency: 20 KHz
Weight: 272 g (contains battery)
Dimension: 420(L)* 138(W)* 110(H) mm
Handle size: 30X30mm
The LED lamp explained that, LED red reports to the police instructs LED the green power insufficient indicating lamp
Battery: one 9V battery (may supply normal work for 40 hours)
Control: Cycling switch (ON, OFF, acousto-optic or vibration way)