How to use Logitech Unifying Software

One thumbnail-sized USB receiver can run your whole desk. Here is how to pair, manage, and fix up to six Logitech devices on a single dongle, plus when you should skip this app entirely for Logi Options+.

What the software actually does

Every Unifying-badged mouse or keyboard ships already paired to the receiver in its box. The software exists for the moments that default does not cover: consolidating several devices onto one receiver to free USB ports, re-pairing a device to a replacement dongle after you lose one, or moving a keyboard between the receivers on two computers.

Under the hood, the receiver is a 2.4 GHz radio. The common retail hardware is marked CU-0007 on its metal shield, while CU-0008 is the lower-latency variant bundled with gaming gear. Each device-to-receiver link is encrypted with 128-bit AES, and the app can lock the receiver against unauthorized pairing.

Check the logo

This is where most failed pairings begin. The software only talks to hardware carrying the orange Unifying star, printed on the receiver and on the underside of compatible devices (common in the MK, MX, and K400 ranges). Two lookalikes will never pair:

• Logitech Nano and device-specific receivers: no star logo, locked to their own device.

• Logi Bolt receivers: the newer standard with a lightning-bolt logo. Bolt and Unifying are mutually incompatible. A Bolt keyboard cannot join a Unifying dongle, and vice versa.

Pair a device in 6 steps

The running example below follows one common real setup: you own an MK270 keyboard and an MX Master mouse, each shipped with its own dongle, and you want both on a single receiver so your laptop keeps a free USB port.

01  Download and install the software

Get the Unifying Software from Logitech's support downloads page for Windows or macOS. If your device is newer, install Logi Options+ instead, since it can pair Unifying receivers with an actively maintained app. On Linux, install the community tool Solaar; the receiver itself has kernel support since Linux 3.2.

Why this matters: the operating system can already read input from a pre-paired receiver, so your mouse "works" without any software. But pairing, unpairing, and firmware updates are functions of the app, not the OS. Without it, the receiver is read-only.

FIG. 01 · Get the installer from Logitech support downloads

02  Plug in one receiver, remove the rest

Insert a single Unifying receiver into a USB-A port, directly on the computer rather than through an unpowered hub or a monitor. Unplug the second dongle and any other wireless receivers before you start pairing.

Why this matters: during pairing, the device broadcasts a join request and connects to the first receiver that answers. With two receivers listening, the keyboard can silently pair to the wrong one, which looks exactly like a failed pairing. One receiver present means one possible answer.

FIG. 02 · One receiver in a direct USB-A port, all others removed

03  Launch the app and start the wizard

Open the software. Windows: Start → Logitech → Unifying Software. macOS: Applications → Utilities. On the welcome screen, click Next. If the main window opens instead, click Add Devices to reach the same wizard.

Why this matters: clicking Next does more than advance a screen. It puts the receiver into discovery mode, a short listening window during which it will accept a new device. Outside this window the receiver ignores join requests by design, which is what keeps a stranger’s mouse from hijacking your dongle.

FIG. 03 · The wizard’s Next button opens the receiver’s pairing window

04  Power-cycle the device when prompted

With the wizard on its "restart your device" screen, switch the mouse or keyboard off, wait two seconds, then switch it on, keeping it within about 30 cm of the receiver. Do this only when the wizard asks for it.

Why this matters: a Unifying device only broadcasts its pairing request in the first seconds after it powers on. If it was already on when you started the wizard, it is not broadcasting anything, so the receiver hears silence. Skipping or mistiming the power-cycle is the single most common reason pairing "does not work."

FIG. 04 · Off, two seconds, on. The power-up moment is the pairing moment

05  Confirm the device works

When the device is detected, the wizard shows a confirmation. For a keyboard it asks you to type a test line in a text field; for a mouse, just move the cursor and click. If nothing responds within about a minute, select No, then Next, and the wizard restarts from the power-cycle step.

Why this matters: detection and function are two different checks. A device can pair at the radio level yet still misbehave because of dead batteries or interference. The test line proves the full chain works: keys to radio to receiver to screen. Confirming now saves you from discovering a half-working keyboard after you have closed everything.

FIG. 05 · Type the test line so pairing is verified end to end

06  Finish, then repeat for each device (up to 6)

Click Finish. The device is now stored in the receiver’s memory. Pairing is one device at a time, so click Add Devices again for the next peripheral and repeat steps 3 to 5 until everything is on the one dongle, up to the six-device ceiling.

Why this matters: pairings live in the receiver, not on the computer. That is why your devices keep working after you uninstall the software, and why the same receiver brings all six devices along when you move it to another machine. It is also why a lost receiver means re-pairing everything to a replacement.

FIG. 06 · Two of six slots filled. Repeat Add Devices for each peripheral

Managing what's connected

See status and battery

The main window lists every paired device with its connection state and, on supported models, a battery indicator, so you can catch a dying keyboard before it dies mid-sentence.

Remove or re-pair a device

Select a device in the list and click Remove to unpair it. If a device drops its link, open Advanced → Pair Again and follow the same off/on wizard. Pairing is not destructive: modern Unifying devices can switch receivers an unlimited number of times.

Advanced tools

The Advanced pane also covers receiver firmware updates, factory reset, and a pairing lock that stops anyone else’s device from silently joining your receiver, which is worth enabling in shared offices.

Troubleshooting, ranked by likelihood

Unifying vs. Logi Bolt vs. Bluetooth

If you're buying new gear in 2026, know which ecosystem you're entering, because the receivers are not cross-compatible.

Bottom line: Unifying remains excellent for the huge installed base of MX and MK era hardware, and replacement receivers keep old devices alive. But it is a maintained-not-developed platform. For new purchases or strict IT environments, Bolt is Logitech’s path forward.

The verdict

Scores reflect the software as it stands in July 2026, judged for its actual job: pairing and managing Unifying-badged hardware.