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1Scan for outdated or missing drivers - takes under a minute2Repair Windows errors before they cause bigger problems3Fix the driver behind crashes, sound loss and screen glitchesDual-purpose function keys are single keyboard keys that can perform two actions. Usually, pressing a key by itself triggers its primary function, while holding Fn and pressing it triggers its secondary function. Some keyboards offer a lock or setting that reverses which action happens on a direct press; the exact behavior depends on the keyboard model.
How dual-purpose function keys work
A dual-purpose key has two functions assigned to one physical key. Its keycap may show both functions, often with one legend printed above or in a different color. Lenovo describes these as primary and secondary functions: on the documented keyboard, pressing the key alone calls the primary function, and holding Fn while pressing it calls the secondary one. Lenovo’s guide to dual-function keys explains that arrangement.
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On many keyboards, this is how the top row works: a key may control a device feature, such as volume or screen brightness, and also send a standard F1–F12 command. The mapping and which action is primary vary by keyboard. A key’s effect can also depend on the active application or configuration.
What Fn and F Lock change
Fn commonly acts as a modifier: hold it while pressing a dual-purpose key to access its alternate command. Microsoft documents that behavior for the keyboards covered by its Fn key, F Lock key, and alternate command keys support page. Some keyboards instead have an F Lock key that switches between standard and alternate commands when pressed.
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- KEYBOARD: The keyboard works for Windows with hot keys that enable easy access to Media, My Computer, Mute, Volume up/down, and Calculator
- EASY SETUP: Experience simple installation with the USB wired connection
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- SLEEK DESIGN: The elegant black color of the wired keyboard complements your tech and decor, adding a stylish and cohesive look to any setup without sacrificing function.
- FULL-SIZED CONVENIENCE: The standard QWERTY layout of this keyboard set offers a familiar typing experience, ideal for both professional tasks and personal use.
Fn behavior is not standardized across all devices. For example, HP says the Fn key is hardware-controlled on HP PCs, while Microsoft Surface documentation describes using Fn with top-row special keys to access function-key behavior. The available keys and their behavior depend on the keyboard or Type Cover model. See HP’s documentation on Fn and function keys and Microsoft’s Surface Type Cover guidance for those specific device families.
How to find which function a key will perform
- Check the keycap legends. Look for two symbols or labels on the key. The device manual can identify which is primary and which is secondary.
- Try the key by itself, then with Fn. Press the key once on its own, then hold Fn and press it. Check the result in a safe context, since some commands change settings or trigger application actions.
- Check for a lock or toggle. If the direct-press behavior is opposite of what you expect, look for an Fn Lock or F Lock key, or consult the device’s settings and manual. Do not assume a shortcut used by another keyboard will work on yours.
Can you change the default action?
Some keyboards let you switch which action runs when you press a dual-purpose key without Fn. For example, Lenovo documents Fn+Esc as the Fn Lock toggle for a particular Legion 5i model generation: with Fn Lock off, a direct press calls the primary function and Fn plus the key calls the secondary; with Fn Lock on, those actions are reversed. That shortcut is specific to the documented model family, not a universal rule. Other keyboards may use a different shortcut, a software or BIOS setting, or provide no user-accessible toggle. See the relevant Lenovo model guidance and check the documentation for your exact device.
Rank #2
- Reliable Plug and Play: The USB receiver provides a reliable wireless connection up to 33 ft (1), so you can forget about drop-outs and delays and you can take it wherever you use your computer
- Type in Comfort: The design of this keyboard creates a comfortable typing experience thanks to the low-profile, quiet keys and standard layout with full-size F-keys, number pad, and arrow keys
- Durable and Resilient: This full-size wireless keyboard features a spill-resistant design (2), durable keys and sturdy tilt legs with adjustable height
- Long Battery Life: MK270 combo features a 36-month keyboard and 12-month mouse battery life (3), along with on/off switches allowing you to go months without the hassle of changing batteries
- Easy to Use: This wireless keyboard and mouse combo features 8 multimedia hotkeys for instant access to the Internet, email, play/pause, and volume so you can easily check out your favorite sites
Where to get model-specific instructions
Use the manual or manufacturer support page for the exact keyboard, laptop, or detachable keyboard model. Check both the keycap legends and the documentation: the same label does not guarantee the same default behavior across brands or models. If you are choosing a replacement keyboard, verify which action is the default on a direct press, whether a lock or comparable toggle exists, which alternate commands are supported, and compatibility with your device and operating system.
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Best Value
- All-day Comfort: This USB keyboard creates a comfortable and familiar typing experience thanks to the deep-profile keys and standard full-size layout with all F-keys, number pad and arrow keys
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- Long-lasting Battery Life: A 24-month battery life (4) means you can go for 2 years without the hassle of changing batteries of your wireless full-size keyboard
- Simply plug the USB receiver into a USB port on your desktop, laptop or netbook computer and start using the keyboard right away without any software installation
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Rank #4
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Rank #3
- All-day Comfort: The design of this standard keyboard creates a comfortable typing experience thanks to the deep-profile keys and full-size standard layout with F-keys and number pad
- Easy to Set-up and Use: Set-up couldn't be easier, you simply plug in this corded keyboard via USB on your desktop or laptop and start using right away without any software installation
- Compatibility: This full-size keyboard is compatible with Windows 7, 8, 10 or later, plus it's a reliable and durable partner for your desk at home, or at work
- Spill-proof: This durable keyboard features a spill-resistant design (1), anti-fade keys and sturdy tilt legs with adjustable height, meaning this keyboard is built to last
- Plastic parts in K120 include 51% certified post-consumer recycled plastic*
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