Optimum sensitivity: detects ferrous, non-ferrous and stainless steel weapons, contraband and other metal objects; Self-calibrating: digital microprocessor technology eliminates the need for periodic sensitivity adjustments; Elongated profile provides 8.75" scan area 360 deg detection coverage plus tip pinpointing for easy scanning from head to foot; Easy and convenient to use with one-touch button and three-color LED lights; Clear audible or Silent / Vibrate LED alarm signal; Rugged injection molded construction including structurally isolated coil for added impact absorption; Ergonomically designed grip fits comfortably in virtually any size hand; Easy ON/OFF battery cover: standard 9V battery included; Power switch and LEDs positioned for easy access and high visibility