Metal detecting: HELP ME PLEASE!

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I got a metal detector for Christmas (It had a nice arm brace, a plug for head phones). So, I opened it, all that stuff, and then it didn't have instructions. Ok, a little weird. Then-NO COMPANY NAME??? There is a spot (see picture) were it looks like there would be some sort of label on it, but nothing is there. Also, since there was no instruction manual, what do these controls mean? 1) Sens 2)disc/tone 3)disc mode 4)all metal mode 5) tone mode Thanks! bugmanavery