Does the Logitech K400 Have Bluetooth? Pairing Without the Dongle
On this page
Short answer: no, the K400 has no Bluetooth. The Logitech K400 Touch, the K400r and the K400 Plus all connect over 2.4 GHz through a small USB Unifying receiver. There is no Bluetooth mode and no USB cable port, so the keyboard can't be used without a receiver. If yours is lost or broken, a replacement Unifying receiver brings it back in a few minutes.
This page explains which receiver to buy, how to pair it, and what to choose if you want a keyboard with a touchpad that needs no dongle at all.
K400 models and how they connect
| Model | Connection | Bluetooth | Notes |
|---|---|---|---|
| K400 (Wireless Touch Keyboard) | Unifying receiver, 2.4 GHz | No | Original model with built-in touchpad |
| K400r | Unifying receiver, 2.4 GHz | No | Same keyboard, sold with the Unifying receiver ("r") |
| K400 Plus | Unifying receiver, 2.4 GHz | No | Adds media keys and a left-click button; made for PCs connected to TVs |
All three run on two AA batteries (Logitech quotes up to 18 months for the K400 Plus) and have a range of about 10 m. Guides that tell you to hold a "Bluetooth button" or plug the K400 in with a cable are describing features this keyboard doesn't have.
Step 1: Get the right receiver
| Receiver | Works with the K400? |
|---|---|
| Unifying receiver (orange star logo) | Works. One receiver can hold up to six Unifying devices, so a receiver from another Logitech mouse or keyboard can be reused. |
| Logi Bolt receiver (green "Bolt" logo) | Does not work. Bolt and Unifying are not compatible. |
| Nano receiver with no logo (from a combo set) | Usually locked to the devices it was sold with and can't be re-paired. |
Already own a Logitech mouse with a Unifying receiver? Pair the K400 to that receiver and you're done, with no purchase needed.
Step 2: Pair the K400 to the receiver
- Plug the Unifying receiver into a USB port on your computer (directly on the PC, not a hub, for the first pairing).
- Install Logitech's pairing software. Logitech now recommends Logi Options+ on Windows and macOS. The older Logitech Unifying Software is still on Logitech's support site but no longer maintained. On Linux, the free tool Solaar does the same job.
- Start pairing (Unifying Software: open it and click Next; Logi Options+: add a device and choose the Unifying receiver option).
- When asked, slide the K400's power switch off and back on. Fresh batteries make a difference here.
- Type a few letters in the test box, then finish.
Pairing is a one-time job. After that the keyboard connects automatically whenever the receiver is plugged in.
On an Android TV box or tablet with USB host support, a K400 Plus that is already paired works as soon as the receiver is plugged in. Do the pairing on a Windows, Mac or Linux computer first.
K400 not working? Quick fixes
| Problem | What to try |
|---|---|
| Keyboard dead, no response | Replace both AA batteries and check the on/off switch. |
| Pairing software doesn't see the receiver | Try another USB port directly on the computer and restart the software. |
| Pairing fails or times out | Hold the K400 within 30 cm of the receiver, switch it off and on when prompted, and try again. |
| Lag or missed keys | Move the receiver away from USB 3.0 ports, metal cases and Wi-Fi routers, or use a short USB extension cable to bring it closer. |
| Touchpad works but scrolling or clicks feel wrong | Change touchpad settings in Logi Options+ (or Unifying Software on older systems); on a TV or Android box, check the device's own mouse settings. |
| Some keys don't work | See our guide on how to unlock a keyboard (Num Lock, Fn Lock and filter keys). |
Want a touchpad keyboard with no dongle?
If the real goal is to avoid a receiver (a tablet, a laptop with few USB ports, a smart TV that only supports Bluetooth), this keyboard isn't the right one. Logitech's Bluetooth models connect with no dongle, for example the compact K380 and its successor Pebble Keys 2 K380s, or full-size models such as the Signature K650 (Bluetooth or Bolt). Our guide on how to connect a wireless keyboard covers Bluetooth pairing on Windows, Mac and Android.
FAQ
Does the Logitech K400 Plus have Bluetooth?
No. Like the original K400 and the K400r, it only works with a Logitech Unifying USB receiver.
Can I use the K400 with a USB cable?
No. The keyboard has no cable port.
Can I connect the K400 to a smart TV?
Only if the TV has a USB port that accepts keyboards. Plug the paired receiver into the TV. TVs that only accept Bluetooth keyboards won't work with the K400.
Does a Logi Bolt receiver work with the K400?
No. The K400 family uses Unifying, which is not compatible with Bolt.
How do I put the K400 into pairing mode?
There is no pairing button. Start pairing in Logi Options+, the Unifying Software or Solaar, then switch the keyboard off and on when asked.