It looks to be an exact copy of the Compact F3 except blue. The F3 has an 8" coil and uses four C cells. The table at bottom of the page says one coil versus large range of coils for GPX? No idea on mono vs DD. We can assume guts are not same as F3 and coil may not be either. The F3 weighs 5.5 lbs with batteries.
F3 Compact Mine Detector | Minelab Countermine
..The ATX killa...lol