Air testing I compared it to my garrett propointer. On sensitivity 3 it was probably just a little deeper than the propointer. On sensitivity setting 5 it was twice as deep. The propointer was louder and i prefer the deeper tone of the propointer. The build quality was prettty good i thought, and if you are easy on your stuff it should give you no problems. I couldn't find the country of origin, two year warranty, but $20.00 shipping after ninety days, dont like that. If it doesn't false like my propointer i'll be okay with it. Would not give $179.00 original posting price. just my 2 cents worth. can't wait to actually use it.