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GARRETT THD Garrett THD Tactical is a Security Handheld Metal Detector which detects quickly and effectively all metal objects, such as steel knives, guns, blades etc. Its detection technology allows a 360-degree coverage ensuring personal searches fast and accurate. No tools are required to replace the battery (included). The THD incorporates three LEDs functional: green indicating the ignition, amber indicating low battery, red which indicates the detection of an object.