Accurately detects a medium-sized pistol from a 9-inch distance, large knives from 6 inches, razor blades from 3 inches, and foil-wrapped items or tiny jewelry from 1 inch.Features sharp audible alarms or silent vibration modes, along with bright red LED indicators when metal is detected.Uses built-in digital microprocessor technology, completely eliminating the need for periodic sensitivity adjustments.Includes a momentary push button to temporarily ignore ambient metal (such as metal walls or rebar in floors) to avoid false alarms. Designed with a rugged, high-impact ABS plastic case and a reinforced coil compartment that exceeds military drop-test standards.Operates for up to 100 hours on a single 9-volt battery, and offers optional rechargeable battery kits.