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The Fully Assembled version includes:

The keyboard PCB, the plate, the case, and the foams.
Keycaps (included Mac & Windows keycaps).
Adjustable-actuation-point Keychron Ultra-fast Lime Magnetic Switch.

The Q3 HE 8K is compatible exclusively with the Keychron Ultra-fast Lime Magnetic Switch. It does not support other magnetic switches, such as the Gateron Magnetic Jade or Gateron KS-20 Magnetic switches.

8K Polling Rate Keyboards

Keychron Q3 HE 8K Magnetic Switch Keyboard