installation is very easy...even a congressman could do it!
On my DFX..."box" part just clips on behind the twist tensioner on the upper rod, and the holding clamp for the actual probe screws into one of the adjustment holes a few inches further down the rod(not sure if there are supposed to be 2 clamps or 1, as I bought mine used)
The coil connector plugs into the box, and the short cable from the box plugs into your detector. Install takes 15 min or less.
2 usage tips to pass along... I've seen MANY comments about people forgetting to throw the little toggle switch back to "coil/hunt" position after they are done probing(box is plainly marked with positions for probe & coil) but it does seem easy to forget, especially after the excitement of of a nice find.
2nd...I didn't figure this out right away, when using the probe to pinpoint, you must activate pinpoint on your machine. Mine is a toggle. The probe is actually a miniature coil and behaves as such. I've seen some posts where people have used it as a coil rather than a pinpointer in very trashy areas with shallow targets or to get really close to say fences or bleachers etc.
The first couple times I tried it, I was more confused than impressed with its ability to pinpoint. After I figured out my mistake, I am very impressed.
Good luck and HH