The PP 3-9 is a 3-9 power scope with a 42mm objective lens that has a small electronic powered dot at the point where the crosshairs meet to pinpoint the point of impact (after the gun is zeroed) in any atmospheric condition. It also has the ability to switch from red to green, (red for bright light and green for low light situations) as needed. Meanwhile the PX version is much the same but the whole thin crosshairs area changes color which is desired larger targets and or fast shooting situations. Either model can operate as a standard scope if the diode is in the "0" (off) position.
ADCO has supplied firearms and accessories through North America and Europe for nearly a quarter of a century. When Red Dot sights first began ADCO pioneers many aspect of shooting and sight designed for reflex sights holding several patents. We have the future in our sights (sm), was our rally call. The best way to say it is that ADCO Sights are Simply Brillient (sm). In recent years ADCO has expanded into supplying dealers and distributors with shotguns and pistols of great value for people on a budget. You can spend more, but you can't beat ADCO.