Safebao Portable Hand Held Metal Detector Wand Security Scanner With Adjustable Highly Sensitive:Our handheld metal detector can detect a hand gun from 8 inches away, a pen knife from 6 inches away, and a razor blade from 4 inches away Adjustable Sensitivity:Sensitivity can be adjusted with the rotation of the screwdriver(not include) Two Indicators:Our metal detector wand have two alternative alert ways, you can use the power switch to choose between audio tone or vibration, easy to operate Applications:Perfect for safety check and the detection of prohibited goods,indoor or outdoor events,schools,cafeterias for food safety,sports events,airport,or anywhere you need dependable metal detection Battery Powered:Our metal detector security is powered by 9 volt battery (Not included)