computer science

Logitech Unifying receiver

Logitech Unifying receiver is a computer science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Logitech Unifying receiver rather than just read about it. In short: The Logitech Unifying receiver is a small dedicated USB wireless receiver, based on the nRF24L-family of RF devices, that allows up to six compatible Logitech human interface devices (such as mice, trackballs, touchpads, and keyboards; headphones are not compatible) to be linked to the same computer using 2.4 GHz band radio communication. Receivers that are bundled with a Logitech product are paired with the device…

Key takeaways

Logitech Unifying receiver belongs to computer science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Logitech Unifying receiver to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Logitech Unifying receiver from memory before moving on to harder problems.

Reference excerpt

The Logitech Unifying receiver is a small dedicated USB wireless receiver, based on the nRF24L-family of RF devices, that allows up to six compatible Logitech human interface devices (such as mice, trackballs, touchpads, and keyboards; headphones are not compatible) to be linked to the same computer using 2.4 GHz band radio communication. Receivers that are bundled with a Logitech product are paired with the device at the factory. When purchasing a replacement receiver or connecting multiple devices to one receiver, pairing requires the free-of-charge Logitech Unifying software, available for Microsoft Windows and macOS. On Linux, the Solaar software can be used to adjust the configurations. Although not compatible with Bluetooth, devices pair to Unifying Receivers in a similar way. Peripherals remain paired, and can then be used on systems not supporting the software. Logitech receivers compatible with the Unifying protocol can be identified by the orange Unifying logo, which distinguishes them from Logitech Nano receivers of similar appearance, which pair similarly but only with a single device, without using the Unifying protocol. Logitech Unifying Receivers (LURs) are often included in wireless Logitech keyboard, mouse, and combo sets, and may be purchased separately. Some Logitech peripherals allow a receiver to be stored inside. A newer receiver named Logitech Bolt was released in 2021 that promises lower latency and higher security, but is incompatible with Unifying products.

Compatibility and use

Each peripheral device can pair to one receiver per profile. While most peripherals only store one profile, newer products such as the Logitech MX Master, MX Anywhere series, and M720 Triathlon allow multiple profiles. These devices can be connected to multiple receivers simultaneously. This allows the use of receivers in several computers, e.g., a desktop and a laptop computer, selecting the computer to use by changing profiles on the mouse. This multi-computer function is further augmented by Logitech Flow (software KVM solution) which is similar to Synergy. For devices without multi-computer support, the receiver and input devices can be moved together from one computer to another, maintaining their paired status after being unplugged, as the pairing information is held in the little USB receiver—this is much simpler than transferring the peripheral from one receiver to another by changing the setup in software, and also avoids the limitation to 45 pairings of older devices. This also allows the use of peripherals on computing devices that do not support Unifying Software, e.g. devices supporting USB OTG with operating systems such as Android: first pair to the receiver on a PC or Mac. Some older Unifying devices limit the number of allowable pairing changes to a maximum of 45 times. Once the 45th connection is made, it is no longer possible to connect such a device to a different receiver. For users who often switch a Unifying device between multiple PCs or laptops with individual receivers, this connection limit can become an issue. For example, a user who frequently switches a mouse between two receivers (e.g. at work and home) will quickly exhaust the limit of available pairing switches. Logitech advises customers with this issue to contact their Customer Care. Newer devices can switch pairings an unlimited number of times. Pairing software is available from Logitech for Microsoft Windows and Mac OS X. Wireless devices using the Unifying Receiver are supported since Linux 3.2. Software to manage Unifying devices on Linux is available from third party developers, such as Solaar. Many companies have made peripherals that connect via USB wireless receivers very similar to Logitech's; Logitech devices are incompatible with many of these "off-brand" receivers. There are many different hardware versions of the unifying receiver. The most common is used for daily use, and is marked CU-0007 on the metal jacket. CU-0008 is distributed with gaming devices, and features lower latency.

Updating firmware Firmware of devices and unifying receivers can be updated by using Logi Options+ software. Linux users can use fwupd to flash an updated firmware. It will automatically detect available updates for any connected unifying receivers and many other firmware updatable devices. An outdated alternative is MouseJack. It is also possible to flash on a Linux/UNIX host via a hypervisor such as VirtualBox along with a Windows virtual guest image and the Windows Logitech update executable. If using a Windows virtual guest, it is recommended to have a second available pointing device while the dongle is being updated, to allow the user to select and enable pass-through of the unifying receiver via the hypervisor task bar after executing the firmware updater so that the device is found and updated. Updating the Unifying receiver firmware to versions RQR12.08 or greater and RQR24.06 or greater can limit some functionality of certain paired devices unless the device's firmware is also updated.

Security Several security vulnerabilities of the Logitech Unifying system were reported in 2014 and 2019, and receiver and device firmware updates were released in response.

MouseJacking and keyjacking MouseJacking, first reported by Bastille Networks, Inc., is the sending of malicious radio signals (packets) wirelessly to an unsuspecting user through Logitech Unifying wireless technology. The exploit takes advantage of a user's vulnerable Logitech Unifying Receiver and unencrypted signals within a range of about 100 meters. Possible exploits include:

Keystroke injection by spoofing either a paired mouse or keyboard Forced pairing

Affected devices and firmware

Firmware not affected

Response Logitech has released Unifying receiver firmware updates as new exploits were reported.

Other vulnerabilities On July 9, 2019 another set of vulnerabilities was disclosed and documented by a different researcher. A firmware update for Unifying receivers addressing the "Encryption Key Extraction Through USB" vulnerability (CVE-2019-13054/55) was released on 28 August 2019. Some users reported in 2019 that some Unifying devices were still being sold that were vulnerable to the original 2016 MouseJacking attack.

See also Bluetooth Human interface device Logitech Harmony

References

External links Logitech Unifying Software

Illustrations

Worked examples

Example 1 — a first encounter with Logitech Unifying receiver

Start with the simplest possible case. Write down what Logitech Unifying receiver claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In computer science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Logitech Unifying receiver before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Logitech Unifying receiver ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Logitech Unifying receiver

In research: Logitech Unifying receiver appears in computer science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Logitech Unifying receiver in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Logitech Unifying receiver is common in secondary-school and first-year university syllabi. It links to neighbouring topics Logitech products, Wireless, Wireless networking hardware, so understanding it makes those chapters shorter.
In everyday life: Look for Logitech Unifying receiver outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Logitech Unifying receiver in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Logitech Unifying receiver means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Logitech Unifying receiver out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Logitech Unifying receiver in simple terms?

Why does Logitech Unifying receiver matter?

Because it connects several computer science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Logitech Unifying receiver?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Logitech Unifying receiver.