Shortcuts

The URX Core75 uses a compact 75% ANSI layout (81 physical keys and 1 tactile rotary knob). To retain full keyboard features in a smaller form factor, the Core75 uses function layers accessed by holding down the FN key.

Wireless RGB and System Configs

These secondary commands work in both Windows and macOS modes:

Connection Profiles

Combination	Profile / Mode	Description	Associated Indicator
`FN` + `Q`	Bluetooth Profile 1	Switches the keyboard to Bluetooth channel 1.	Under-key LED glows static Blue when holding down `FN` if this profile is active. Blinks rapidly during pairing, blinks slowly during reconnection. Blinks Red if physical switch blocks.
`FN` + `W`	Bluetooth Profile 2	Switches the keyboard to Bluetooth channel 2.	Under-key LED glows static Blue when holding down `FN` if this profile is active. Blinks rapidly during pairing, blinks slowly during reconnection. Blinks Red if physical switch blocks.
`FN` + `E`	Bluetooth Profile 3	Switches the keyboard to Bluetooth channel 3.	Under-key LED glows static Blue when holding down `FN` if this profile is active. Blinks rapidly during pairing, blinks slowly during reconnection. Blinks Red if physical switch blocks.
`FN` + `R`	2.4GHz Wireless	Switches the keyboard to 2.4GHz wireless mode.	Under-key LED glows static Green when holding down `FN` if wireless mode is active. Blinks rapidly during pairing, blinks slowly during reconnection. Blinks Red if physical switch blocks.
`FN` + `T`	Wired USB Mode	Switches the keyboard to wired USB connection mode.	Under-key LED glows static White when holding down `FN` if wired mode is active. Blinks Red if USB cable is unplugged or unpowered.

RGB Matrix Controls

Combination	Control Action	Description	Associated Indicator
`FN` + `Backspace`	RGB Toggle	Turns the backlights and dynamic RGB animations on or off.	None
`FN` + `\`	Next Animation Effect	Cycles forward to the next built-in RGB matrix lighting animation effect.	None
`FN` + `PgUp`	Next Palette+	Cycles forward to the next built-in color palette.	None
`FN` + `PgDn`	Next Palette-	Cycles backward to the previous built-in color palette.	None
`FN` + `▲` (Up Arrow)	RGB Brightness Increase	Increases the backlight brightness level.	All keys blink White 3 times if maximum brightness limit is reached.
`FN` + `▼` (Down Arrow)	RGB Brightness Decrease	Decreases the backlight brightness level.	All keys blink White 3 times if minimum brightness limit is reached.
`FN` + `►` (Right Arrow)	Animation Speed Increase	Speeds up the animation cycle speed of dynamic lighting effects.	All keys blink White 3 times if maximum speed limit is reached.
`FN` + `◄` (Left Arrow)	Animation Speed Decrease	Slows down the active dynamic lighting animation speed.	All keys blink White 3 times if minimum speed limit is reached.

Custom Functions

Combination	Function	Description	Associated Indicator
`FN` + `S`	OS Layout Toggle	Toggles the system layout layers between Windows (Layer 0) and macOS (Layer 1) modes.	Caps Lock LED blinks Yellow (1 time for Windows, 3 times for macOS).
`FN` + `D`	Sleep Standby Timer	Cycles the inactivity wireless sleep timeout (1m / 3m / 10m / 30m).	Function row keys `F1`-`F12` light up in static Cyan representing the active minutes when holding `FN`.
`FN` + `F`	Wireless Max Brightness Unlock	Toggles the wireless brightness clamp on or off to allow full 255/255 brightness.	None (forces instant visual update of backlights).
`FN` + `X`	SOCD Cleaner Toggle	Toggles the Simultaneous Opposing Cardinal Directions cleaner for WASD keys.	`S` key glows static Red when holding down `FN` if active.
`FN` + `Enter`	Battery Level	Temporarily displays the battery charge level on the keyboard.	Numeric Row `1`-`0` lights up as proportional color blocks (Green/Yellow/Red) or a green wave animation (charging).
`FN` + `LWin`	Windows Key Lock	Locks the Left and Right GUI (Windows) keys in Windows mode to prevent game interruptions.	Left `Win` key glows static White when active.
`FN` + `LCtrl`	RGB Test Mode	Enters the color check loop. Press `Space` to cycle Red -> Green -> Blue -> White, or press any other key (except Space, FN, or Left Ctrl) to exit.	All keys cycle colors.
`FN` + `Space` (Hold 3s)	Factory Reset / Clear EEPROM	Factory resets and clears all custom configurations.	Spacebar blinks Red for 3 seconds, then lights up solid Red for 1 second before resetting.

FN Key Combinations

Windows Function Layer — Layer 2

When Windows layout is active, hold FN to access the secondary commands:

Combination	Primary Key	Secondary Command
`FN` + `F1`	F1	Open My Computer
`FN` + `F2`	F2	Open File Explorer (Win + E)
`FN` + `F3`	F3	Open Calculator
`FN` + `F4`	F4	Open Email Client
`FN` + `F5`	F5	Open Media Player
`FN` + `F6`	F6	Stop Media Playback
`FN` + `F7`	F7	Previous Track
`FN` + `F8`	F8	Play / Pause Media
`FN` + `F9`	F9	Next Track
`FN` + `F10`	F10	Mute Volume
`FN` + `F11`	F11	Volume -
`FN` + `F12`	F12	Volume +
`FN` + `Delete`	Delete	Insert

macOS Function Layer — Layer 3

When macOS layout is active, hold FN to temporarily restore standard functional keys:

Combination	Primary Key	Secondary Command
`FN` + `F1`	F1 (Brightness -)	Standard F1 Key
`FN` + `F2`	F2 (Brightness +)	Standard F2 Key
`FN` + `F3`	F3 (Mission Control)	Standard F3 Key
`FN` + `F4`	F4 (Launchpad)	Standard F4 Key
`FN` + `F5`	F5	Standard F5 Key
`FN` + `F6`	F6	Standard F6 Key
`FN` + `F7`	F7 (Previous Track)	Standard F7 Key
`FN` + `F8`	F8 (Play / Pause)	Standard F8 Key
`FN` + `F9`	F9 (Next Track)	Standard F9 Key
`FN` + `F10`	F10 (Mute)	Standard F10 Key
`FN` + `F11`	F11 (Volume -)	Standard F11 Key
`FN` + `F12`	F12 (Volume +)	Standard F12 Key
`FN` + `Delete`	Delete	Insert