I am trying to figure out what comes with the purchase and how you install it? Do I just detach the current shower head that I have and screw this one on?
Yes. There’s usually some Teflon tape involved. IME just barely enough comes in the package. These are not difficult to install at all.
Once the old unit is removed it is very easy. You will not need tools to install follow the instructions and do not over tighten as it can compromise the rubber washers.
Everything needed to install the unit in about 10 mins after removing you old unit. Included with the system are what I can only describe as amazing instructions you will find them direct and helpful.