Specification :

The MD-3003b1 metal detector is a high performance hand held metal detector designed to meet the exact requirements of the security industry. Typical uses will include body search for offensive weapons in crowd control, airport and border security, checking parcels and letters for metal objects and anywhere that hidden metal needs to be detected.
Technical Specifications
Power Voltage 9V(6F22) standard or rechargeable battery
Power : 270mW
Operate Frequency 22KHz
Operate Current < 50mA
Operating Voltage 7V-9V
Operating temperature: -50 to +55 
Net Weight  409g
Dimension  41(L) X 8.5(W) X 4.5(H)cm
IndicatorVisual: Red / Green LED
Detecting way : Speaker or Earphone;(Earphone not included) , vibration
ControlOn/Off Switch; Low sensitivity Switch Sensitivity Adjuster
Performance
The sensitivity of the detector is determined primarily by the size, shape and composition of the object to be detected.
Maximum detection range:

Object low sensitivity optimum sensitivity
38 caliber hand gun 15cm 20cm
pen knife: 10cm, 15cm
Razor blade: 5cm 10cm
Export Packing25 Pieces Per Carton 0.089CBM N.W 10.3KG ;G.W 16.5KG
Attachment for freeHolster