Detection distance:
38 model handgun    15cm-20cm
Pen, knife           10cm-15cm
Shave blade         5cm-10cm
25¢                45mm
Pin                15mm
The sensitivity is decided by the size, shape and the component of metal
Technical Specifications:
Battery: 9V battery or rechargeable battery
Power: 270mW
Operating frequency: 22 KHz
Operating current: <50mA
Operating voltage range: 7~9V
Temperature range: -5℃~55℃
Net weight: 280g
Size: 39.5（L）X6.8(W)X3.2(H)

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