The Fully Assembled version includes:
The keyboard PCB, the case, and the aluminum plate.
Keycaps (included Mac & Windows keycaps).
Adjustable-actuation-point Gateron 2.0 magnetic switches.
The Q3 HE is compatible exclusively with the Gateron Double-Rail Magnetic Switch. It does not support other magnetic switches such as the Gateron Magnetic Jade or Gateron KS-20 Magnetic switches.