Details

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GAMING FREAK GT XX1 (Blue Switch)
According to the Gaming Freak website and other retailers like Shopee Malaysia, this model is the most common version. 
Switch Type: Blue Mechanical Switch (OUTEMU)
Operating Force: 60 ± 15g, offering a medium resistance with an audible click and tactile feedback.
Keys: 104 CIY (Change It Yourself) pluggable keys, 26-key anti-ghosting.
Backlight: Features 20 LED lighting modes.
Lifespan: Rated for over 10 million clicks.
Included: Comes with 2 extra switches and a keycap/switch removing tool.
Compatibility: Windows XP/Vista/7/8.1/10

GAMING FREAK GT XX1 (Brown Switch)
This version offers a different key switch experience. 
Switch Type: Brown Mechanical Switch.
Operating Force: 60 ± 15g, with medium resistance and tactile feedback, but no audible click.
Keys: 104 CIY (Change It Yourself) pluggable keys, 26-key anti-ghosting.
Backlight: Features 20 LED lighting modes.
Lifespan: Rated for over 10 million clicks.
Included: Comes with 2 extra switches and a keycap/switch removing tool.
Compatibility: Windows XP/Vista/7/8.1/10