Features: Hot-swappable mechanical keyboard. 3 layers fully programmable (Fn1 + Fn2 + Fn3). Waterproof motherboard design, dustproof. Keycaps for PBT dye sublimation. NKRO, fully anti-ghosting, optical gateron switch. 60% layout, 64 keys. · 16.8 million RGB backlight, compatible with Mac & Win Three layers of programmable modes Custom mode - Press FN + W, W, the white light will turn on, and you are in the built-in level 1 to customize your keyboard. Press FN + W again to return to the normal keyboard. Mac OS mode. - Press FN+E, and the white light will turn on. If you are in the built-in Layer-2-Mac OS keyboard mode, press FN + E again to return to the normal keyboard. FNX Adjustable Function Definition Mode - Press FN+R, R white light will light up, and you are in the built-in level 3 to customize your keyboard. Press FN + R again to return to the normal keyboard. Specifications: Model: MIHIYIRY SK64 Wired Mechanical Keyboard Number of keys: 64 keys. Colour: black, white. Switch: optical gateron switch (blue/brown/red/black switch available) Connection: USB type C wired. Material: PBT Cable: 1.5 m USB cable. System support: Windows / Android / Mac OS. Anti-ghost keys: NKRO Backlight: 16 million RGB backlight. Keyboard size: 295 x 105 x 45 mm. Keyboard weight: 768g