Proven to accurately detect concealed metallic items, the SuperScanner is the most recognized hand-held metal detector in the world and has led the industry for over 20 years. Additional features: No tools required to change 9V battery Sharp audible alarm and bright red LED light indicator Momentary push button eliminates ambient metal detection Large 10-inch scan surface for quick, thorough scanning Green LED light indicates ON Amber LED indicates low battery Red LED indicates ALARM One switch operation. Does not require adjustments. Detects medium sized pistol from 9 inches. Finds large knives from 6 inches. Detects foil-wrapped drugs and tiny jewelry.