Kennedy Mend

As the image show below, alarm metal, no option to chose 

This is the side image of my detector

I have Gpx5000 detectors newly bought but it menu list is different from what I view from the web. On the my menu list there was no option to chose during the Alarm Metal but in the manual book there was options like Non ferrous, Gold, Silver. Now the question is without that option can my gpx work or not ? Or how can I get the alarm metal chose on the LCD menu on my detector.. Thanks for Helping