Operation How do I nse a metal detector?

The metal detector does not expose you to ionizing radiation, e.g. x- rays, neither do the wands that are used for individual screening. Metal detectors operate by generating a low-intensity magnetic field that passes from one side of the detector to the other. https://detectorly.com/metal-detectors-hobby-security-commercial

No metal detectors don't detect magnets. The operation of metal detectors is based upon the principles of electromagnetic induction. Metal detectors contain one or more inductor coils that are used to interact with metallic elements on the ground. A pulsing current is applied to the coil, which then induces a magnetic field shown in blue. https://detectorly.com/how-to-use-metal-detector

About Bounty Hunter Gold Digger Metal Detector with 7" Closed Waterproof Coil. The entire line of Bounty Hunter metal detectors operate on two 9-Volt batteries (not included) and are designed to be lightweight and ergonomic for easy handling and comfortable use. Bounty Hunter Gold Digger Metal Detector Review Detectorly

Hope this is what you are needing. https://www.detecting.com/manuals/Tracker%204%29%20REV%203%2012.04.12%20-%20Reader.pdf

nSE means "No Specific Error".
The recomendation is return your devise to workshop

I still think you can't rely too much on metal detector. Well, metal detecting is far more difficult than you think. Besides owning a good metal detector, the most important thing is that you should be very patient. Because you will find much more scraps than treasures.

You can get a downloadable manual for all Bounty Hunter,Garrett and many other brands of metal detectors at www.Shopmetaldetectors.com

http://weien.ecpush.com/

here is the supplier of this model..it is made in china

http://www.famoustrails.com/manuals/MD7030%20Manual.pdf

here is the link
Chadman