Logitech K400 Plus
Is the K400 Plus right for you?
The K400 Plus is a wireless keyboard that connects through Logitech's USB Unifying receiver and runs on two AA batteries, and Logitech describes it as having a built-in touchpad.
Best for
- People who run a computer connected to a TV. Logitech says its media controls "make navigating your PC-controlled TV a breeze".
- People who'd rather not recharge a keyboard. It takes 2 AA batteries, and they're in the box.
Skip if
- Your device has no free USB port. Logitech lists an available USB port as required.
- You want backlit keys. Logitech's support specifications list backlighting as "n/a".
Want to see it next to a mouse and a headset? Try it on the QuickDesker board and build a whole desk setup around it.
What does it cost, and what should you check first?
- Seen at Best Buy for $29.99 (Black) on 22 Oct 2026
- Seen at Logitech.com for $29.99 (Black) on 22 Oct 2026
Prices change, so check the current one before you buy. Logitech sells it in Black.
Logitech's product page lists the keyboard, a Logitech Unifying receiver, 2 AA batteries (pre-installed) and user documentation in the box.
Logitech gives it a 1-Year Limited Hardware Warranty.
How long do the batteries last?
Logitech's support specifications quote up to 18 months from the two AA batteries. Its product page credits "a handy on/off switch and power-saving technology" for preserving that. A keyboard that runs on AA cells is topped up by swapping in fresh batteries, not by plugging it in.
It connects by Logitech's Unifying protocol (2.4 GHz) through the USB receiver.
What do reviewers say?
Two reviews singled out the touchpad. One praised having a built-in trackpad; another found the trackpad fairly responsive, with a convenient left-click button.
They split on the build. One found noticeable flex and torsion in the all-plastic board; the other found it well constructed while remaining light.
Full specifications
| Connections | Logitech Unifying protocol (2.4 GHz) |
|---|---|
| Battery | 2 x AA (included) |
| Battery life, as quoted | Up to 18 months (not rechargeable) |
| OS compatibility | Computers, phones, and tablets that support external keyboards; Windows 10, 11 or later; Android 7 or later; ChromeOS™; USB connection: Available USB port required |
| Backlight | n/a |
| Weight | 13.76 oz (390 g) (Logitech product page) · 380.0 g (13.4 ounces) (Logitech support specifications) |
| Remapping software | Logitech Options |
| Spill resistance claimed | Spill-resistant design |
| Receiver | USB Unifying receiver |
| Warranty | 1-Year Limited Hardware Warranty |
| In the box | Keyboard, Logitech Unifying receiver, 2 AA batteries (pre-installed), User documentation |
Logitech's K400 Plus product page and support specifications don't list a key count, a key switch type, a polling rate or an included wrist rest.
Specifications from Logitech's K400 Plus product page and support specifications, read 14 Sep 2026.