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Instruction Manual — Slim X3 Bluetooth Backlit Keyboard

This manual covers setup, pairing, charging, and features for the Satechi Slim X3 Bluetooth Backlit Keyboard (Model: ST-BTSX3M / ST-BTSX3S).

📄 Download User Manual — Slim X3 Bluetooth Backlit Keyboard · PDF · 2.1 MB

In the Box

Slim X3 Bluetooth Backlit Keyboard, USB-C Charging Cable, User Manual.

Specifications

Model: ST-BTSX3M (Space Gray) / ST-BTSX3S (Silver)
Wireless Connectivity: Bluetooth (up to 4 devices simultaneously)
Wired Connectivity: USB-C

System Requirements: Bluetooth 3.0 or later | macOS X v10.4 or later | iOS (Bluetooth enabled)

Parts Reference

1. On/Off Switch — Slide switch on top of the keyboard to power on or off.
2. Power/Charging LED Indicator — Shows battery and charging status.
3. Fn Lock LED Indicator — Lights up brighter when Fn Lock is enabled.
4. Bluetooth Device Keys with LED Indicator — Keys ✱1, ✱2, ✱3, ✱4 to switch or pair Bluetooth channels.
5. Fn Key — Hold with other keys to access function key shortcuts.
6. USB-C Charging Port — Connect USB-C cable here to charge the keyboard.
7. Media / Function Keys — Top row for media controls and system shortcuts.
8. Caps Lock LED Indicator — Lights up when Caps Lock is active.
9. Numberpad — Numeric keypad on the right side of the keyboard.

Note: The keyboard layout function is based on iOS and macOS default settings. The output might differ for different OS.

Powering On / Off

To turn the keyboard on or off, move the slide switch on the top of the device to the "on" position. The power indicator turns green for approximately 3 seconds and then turns off.

Pairing Your Devices

The Slim X3 supports up to 4 Bluetooth devices simultaneously.

1. Press and hold one of the Bluetooth Keys (✱1, ✱2, ✱3, or ✱4) for approximately 3 seconds. The white LED will start blinking.
2. On your device, open Bluetooth settings and look for "Slim X3 Keyboard". Select "Connect" to pair.
3. The white LED will stop blinking when pairing is successful. Repeat to add up to 4 devices.

Switch between paired devices: Quickly press ✱1, ✱2, ✱3, or ✱4 to switch between paired devices.

Note: After 30 minutes of inactivity, the keyboard enters sleep mode — press any key to wake it. To use F1–F15 function keys, press Fn + Fn Lock to enable function key mode.

Wired Mode

The Slim X3 also supports USB wired connectivity. Press Fn + Eject to activate wired mode when a USB-C cable is connected. The power LED turns green. Press ✱1–✱4 to switch back to Bluetooth mode.

Charging Your Keyboard

When the battery is low, the power indicator will flash green. Connect the keyboard to a computer or USB-C wall adapter using the included USB-C charging cable. Charge for 2 to 3 hours, or until the red charging LED turns green. The keyboard can be used wired or wirelessly while charging.

LED Indicators

Power/Charging LED:
On/Off — turns green for 4 seconds, then turns off.
Low Battery — flashes green.
Charging — turns red.
Fully Charged — turns green and stays green.

Fn Lock LED: Press Fn + Fn Lock key to swap between Media keys and F-Keys. The white LED gets brighter when Fn Lock is enabled.

Backlight

There are 10 backlight levels. Adjust brightness at any time:
F5 — Decrease keyboard backlight
F6 — Increase keyboard backlight

The keyboard has a white backlight only. The backlight dims automatically after 1 minute of inactivity and turns off after 3 minutes. Press any key to wake the keyboard. The backlight also turns off automatically when the battery is low.

Hot Key Function Guide

Key	macOS Function	iOS Function
☀ Brightness Down (F1)	Decrease Display Brightness	Decrease Brightness
☀ Brightness Up (F2)	Increase Display Brightness	Increase Brightness
🔍 Spotlight (F3)	Spotlight Search	Spotlight Search
⊞ App Switcher (F4)	App Switcher	App Switcher (iPad only)
Backlit Down (F5)	Decrease Keyboard Backlight	Decrease Keyboard Backlight
Backlit Up (F6)	Increase Keyboard Backlight	Increase Keyboard Backlight
⏮ Previous Track (F7)	Previous Track	Previous Track
⏯ Play / Pause (F8)	Play / Pause	Play / Pause
⏭ Next Track (F9)	Next Track	Next Track
🔇 Mute (F10)	Mute	Mute
🔉 Volume Down (F11)	Volume Down	Volume Down
🔊 Volume Up (F12)	Volume Up	Volume Up
⏏ Eject / Wired Mode	Eject	Activate Virtual Keyboard
🔒 Fn Lock	Fn Lock	Fn Lock
Clear	Clear	Touch Clear

Frequently Asked Questions

Can I use this as a wired keyboard?
Yes. The Slim X3 Keyboard includes USB wired connectivity. Pressing the "FN + EJECT" keys will activate the USB wired mode for the keyboard.

How do I pair with Windows 10?
You need to pair through Control Panel and not Bluetooth Settings.

Does the keyboard come with different color light options?
Unfortunately, the keyboard is only equipped with a white backlight. However, you are able to cycle through 10 different brightness options.

How long does the battery last on a full charge?
The battery life of the keyboard can vary depending on the level of the backlight brightness, but the longest the keyboard can last on a full charge is approximately 80 hours.

Why did my keyboard backlight dim or turn off automatically?
The backlight will automatically dim after one minute of non-usage. It will also turn off automatically once it reaches low-power mode. A green flashing LED indicates Low-Power Mode.

Safety Instructions

Warning: Fire, electric shock, or damage to the keyboard could occur if the following instructions are not obeyed.

1. Keep away from microwave radiation sources.
2. Do not place heavy objects on this product.
3. Avoid dropping or bending the keyboard.
4. Keep away from oil, chemicals, or organic solvents.

Need Help?

Contact Satechi Support at support.satechi.com or email support@satechi.com.
Phone: +1 858 268 1800 | Website: www.satechi.com