The Guardian The Guardian Security Wand is a full-featured top of the line hand held metal detector. Light weight for long-term use, but remarkably strong for durability, the Guardian is a professional grade security detector. With features only found in models far more expensive, this wand goes right to the top of the list for many uses including private security forces, airports, nightclubs, schools, government applications, and police departments. Features: Audio, Vibration, and LED alerts Comfort Grip Wrist Strap 3 Mode Operating Frequency Momentary Low Switch (helps minimize interference) Low Battery Indicator 8.0 kHz Operating Frequency