Ultimate sensitivity Does not require adjustments Rugged, high-impact ABS case with reinforced coil compartment Detects medium sized pistol from 9"; large knife from 6"; razor blade and box cutter from 3"; foil-wrapped drugs and tiny jewelry from 1" Large 10" scan surface for quick, thorough scanning No tools required to change 9V battery Sharp audible alarm and bright red LED light indicates the detection of metal Momentary push button temporarily eliminates detection of nearby ambient metal such as rebar, metal walls, etc. Power 9V(6F22) Operate Frequency 22KHz Operate Current < 50mA Operate 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 objects such as a hand gun, knife, etc. Export Packing 25 Pieces Per Carton Size: 0.089CBM N.W 10.3KG ; G.W 16.0KG Dimension of Unit 410(L) X 85(W) X 45(H) mm Weight of Unit 409G Color Black Attachment for free Holster Attachment for order Rechargeable battery Green LED light indicates ON; Amber LED indicates low battery; Red LED indicates ALARM