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This User Manual covers all features, setup, and shortcut key functions for the Satechi Slim LX3 Wired Keyboard (ST-KULX3C-EN Space Gray / ST-KULX3S-EN Silver), a full-size wired keyboard with numeric keypad, compatible with Mac and Windows.

What's In The Box

Slim LX3 Wired Keyboard, USB-C to USB-A Adapter, User Manual.

Specifications

Model: ST-KULX3C-EN (Space Gray) / ST-KULX3S-EN (Silver)
Connection Type: USB-C (USB-A adapter included)
Layout: Full-size with numeric keypad

Functions

1. USB-C Connector with USB-C to USB-A Adapter — Built-in cable for connecting to your device.
2. Function Lock — Locks the F1–F13 keys to their standard function key behavior.
3. Media / Functions Keys — Top row keys for media controls and system shortcuts.
4. Fn Key — Hold with other keys to access function shortcuts.
5. Caps Lock LED Indicator — Lights up when Caps Lock is active.
6. Num Lock Key — Toggles the numeric keypad's Num Lock state.
7. WIN Modifier Keys — Active when the keyboard is switched to WIN mode.
8. MAC Modifier Keys — Active when the keyboard is switched to MAC mode.
9. Numeric Pad — Full numeric keypad.
10. MAC / WIN Switch — Selects the operating system mode.
11. Power / Charging LED — Indicates power status.

Setup

Plug & Play

Plug into a USB-C or USB-A port (using the included adapter) and the keyboard will be detected by the device automatically.

MAC / WIN Mode

Use the MAC/WIN switch on the top edge of the keyboard to select your operating system. In WIN mode, the WIN modifier keys are active; in MAC mode, the MAC modifier keys are active.

LED Indicators

On/Off — turns green for 3 seconds and turns off.
Caps Lock — white LED turns on when Caps Lock is enabled.

Hot Key Function Guide

Note: The key function is based on the OS selected via the MAC/WIN switch. For buttons F1–F13, press Fn + Esc to enable the function.