Handheld Metal Security Detector - Wrist Strap - TM95000-YXThis is the same type of metal detector that is used by security guards at hospitals, courthouses, public concerts, and many other crowd control situations. This detector sounds an alarm when passing over a metal object. You can also turn off the alarm function, and it will vibrate instead. It operates on one 9 Volt battery (not included)* This Metal Detector Is 13 3 4 Inches Long, With A 5 1 2 Inch "halo" Type Detector * Comes With A Wrist Strap So