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Logitech MX Keys S vs K400 Plus: Which Setup Fits You?

Choose MX Keys S for a desk with a separate pointer, especially when you want a numeric keypad or switch among computers. Choose K400 Plus for typing and touchpad navigation in one unit on a compatible TV-connected PC. Its integrated pointer can be more relevant than the MX model’s extra connection options.

Published by Pickoryx · Published 2026-10-05

Source checked 2026-10-05 07:54 UTC

Products compared

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The buying question

Do you need a numeric keypad and multiple keyboard connections, or typing and pointing together for a receiver-equipped PC?

Separate pointing and multi-host flexibility versus an integrated touchpad and receiver-based setup.

Quick verdict

When to skip: You require both an integrated touchpad and illuminated keys in one keyboard.
When the recommendation changes
  • The host cannot accept the required USB receiver.
  • You need both a built-in touchpad and backlit keys.
  • Frequent number-pad work becomes more important than all-in-one control.

The differences that matter

Pointer And Number Entry Layout

Logitech MX Keys S (Graphite, 920-011558)

Dedicated numeric keypad; no integrated touchpad.[1]

Logitech K400 Plus (Black, 920-007119)

Integrated touchpad and mouse buttons; number row but no dedicated numeric keypad.[2, 3]

What this changes: MX Keys S fits a desk with a separate pointer and frequent numeric entry. K400 Plus puts typing and cursor control in one unit for a compatible TV-connected PC.[1, 2, 3]

The better fit depends on your priorities

Host Switching And Connection Setup

Logitech MX Keys S (Graphite, 920-011558)

Bluetooth or included Logi Bolt receiver; Easy-Switch selects among up to three paired computers.[4]

Logitech K400 Plus (Black, 920-007119)

USB Unifying receiver required; documented connection is Unifying 2.4 GHz.[2, 5]

What this changes: Choose MX Keys S for keyboard-side host switching or a compatible Bluetooth-only setup. K400 Plus suits a receiver-equipped computer where integrated pointing matters more.[4, 2, 5]

The better fit depends on your priorities

Best for your routine

Spreadsheet work with an existing mouse or trackpad

Best fit: Logitech MX Keys S (Graphite, 920-011558)

Based on listed features, not comparative testing.

The dedicated numeric keypad matches that input routine. This is a layout choice, not a measured typing-speed advantage.

View Logitech MX Keys S (Graphite, 920-011558) on AmazonPaid link

Browsing and searching from the couch on a TV-connected PC

Best fit: Logitech K400 Plus (Black, 920-007119)

Based on listed features, not comparative testing.

The built-in touchpad keeps text entry and cursor navigation together, provided the PC supports the receiver setup.

View Logitech K400 Plus (Black, 920-007119) on AmazonPaid link

One keyboard shared among a work computer and personal devices

Best fit: Logitech MX Keys S (Graphite, 920-011558)

Based on listed features, not comparative testing.

Easy-Switch supplies explicit channel selection; confirm each host’s Bluetooth or Bolt requirements.

View Logitech MX Keys S (Graphite, 920-011558) on AmazonPaid link

Value and trade-offs

One or both observed offers have eligibility conditions, so no unrestricted price difference is shown.

If MX Keys S costs more, justify the premium through number-pad use, backlighting or multiple-host setup. For a couch PC, a higher-priced keyboard can still leave you needing a separate pointer.

Insufficient price history for a purchase-timing recommendation.

Limitations

  • This comparison covers the stated US consumer SKUs, not older MX Keys, MX Keys S for Mac, a combo bundle, or another K400 variant.
  • K400 Plus is marketed for a computer connected to a TV. That does not establish compatibility with every television’s own operating system or USB port.
  • No head-to-head typing, latency, range, comfort or durability testing was performed. Host switching describes the keyboard, not automatic switching of a separate mouse.

Questions shoppers ask

Can the K400 Plus replace a separate mouse?

For its supported PC setup, its touchpad and click buttons provide cursor control. The trade-off is losing the separate numeric keypad found on MX Keys S.

Can I reuse one Logitech USB receiver for either model?

No. MX Keys S uses Bolt; K400 Plus uses Unifying. Logitech says these receiver families are incompatible, so check the receiver type rather than the logo alone.

Which should I choose if the computer has no free USB port?

MX Keys S can connect directly to a compatible Bluetooth host. K400 Plus requires its USB receiver; do not buy it on the assumption that wireless means Bluetooth.

Methodology and sources

Compared pointing and numeric-entry layouts separately from receiver and host-switching requirements.

AI-assisted source research and drafting; product layouts were checked against manufacturer images.

View 6 sources
  1. 1.MX Keys S, Graphite 920-011558Logitech · Official specifications · Source checked 2026-10-05 07:53 UTC
    Evidence used on this page
    • US Graphite selection; linked US top-view image; Smart illumination: Exact consumer selection and visually checked layout: numeric keypad, no touchpad. Describes smart backlighting.
  2. 2.K400 Plus Wireless Touch Keyboard, 920-007119Logitech · Official specifications · Source checked 2026-10-05 07:50 UTC
    Evidence used on this page
    • Description; Quiet keys, large touchpad; Wireless and compatible: PC-connected-TV role, integrated pointer and USB Unifying setup. Generic UK gallery image is not used to establish US key legends.
  3. 3.Supercharge Your School’s IT Team: K400 Plus 920-007119Logitech · Official specifications · Source checked 2026-10-05 07:53 UTC
    Evidence used on this page
    • Page 2, K400 Plus Wireless Touch Keyboard tile and product image: Official SKU-labelled image was rendered and checked: integrated touchpad, number row, no dedicated numeric keypad.
  4. 4.Getting Started: MX Keys SLogitech · Official specifications · Source checked 2026-10-05 07:50 UTC
    Evidence used on this page
    • Detailed setup; Pair to a second computer with Easy-Switch; Multi-OS keyboard: Included Bolt receiver or direct Bluetooth; up to three paired computers and a short key press to switch channels.
  5. 5.Wireless Touch Keyboard K400 Plus Technical SpecificationsLogitech · Official specifications · Source checked 2026-10-05 07:50 UTC
    Evidence used on this page
    • Required Accessory; Connection Type; Backlighting: USB Unifying receiver is required; connection uses Unifying 2.4 GHz. Backlighting is marked not applicable.
  6. 6.Are Logi Bolt devices compatible with Unifying USB receivers?Logitech · Official specifications · Source checked 2026-10-05 07:51 UTC
    Evidence used on this page
    • Answer paragraph: The two receiver families are mutually incompatible; applied only after each keyboard’s family is established.

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