You can buy the drill by itself (drill, batteries, charger, case) or add the eccentric, Centrotec and 90* adapter.
The drill is not cheap.
However, as far as the eccentric and 90* adapters go, it is unique. The adapters can be rotated to any of 12 (not 100% sure by memory) positions on the drill face. The drill will also accept a 1/4 hex driver by itself. Bonus: the adapters lock in place. Try that with an add on 90* adapter (and the $50+ Milwaukee adapter is nice, but does not lock in place).
Don't let the 12v battery fool you. This drill has power to spare, and the electronics will cut off the motor if it is overloaded. I could drive a screw *through* 1/2" of pine, drywall and then into the wall stud.
It is rated for something like 1,000,000 screws. No brushes to wear out. ECM motor.
You can get them at any Festool dealer. I got mine at Bob Marino's Best Tools when they were on sale, replaced by a Li-Ion battery model.
I have found it to be well worth the money. If I did cabinets every day, I would have two of these.
It is that good.