New Logitech Unifying USB Receiver for Mouse Keyboard M515 M570 M600 N305 MK330 MK520 MK710 MK605

You do have to download a small app to configure the device, and the web address that came with the unit for getting that app was incorrect. However, I did a Google search, found and downloaded the app, and the installation was quick and easy to do. The device works great.

Works for M570 trackball mouse. Thank gosh, as I needed to replace mine badly as I lost it over a year ago and have been using a regular mouse that I'm not really fond of ever since. Seems a little pricey, but much cheaper than buying a new trackball mouse. Make sure your mouse is compatible however, as this isn't 100% universally compatible with all Logitech mice (although I'm pretty sure they make different universal receivers, which altogether cover most if not all of their products)...nice that it will work on multiple devices as well. Make sure you download the software online btw, as you won't be able to use your accessories with this receiver without downloading the software first. Also as a sidenote, if you are using this for a mouse, especially a trackball mouse, I recommend also downloading the "Smartpoint" software as well, as it lets you customize the function of the buttons on your mouse.

Note: This unifying receiver works as designed with unifying compatible hardware. This review is to notify everyone about the confusion between the two different types of receivers and hardware being sold, unifying and non-unifying, and how important it is to check your hardware before ordering a replacement receiver. In August 2014 I purchased the Logitech MK270 combo mouse and kb from Amazon. It all worked perfectly right out of the box. A few weeks later my son lost the the USB receiver, so I went looking for a replacement and found this on Amazon: New Logitech Unifying USB Receiver for Mouse keyboard M515 M570 M600 N305 MK270 MK330 MK520 MK710 MK605 Notice my MK270 is included. So I was confident this is the right replacement receiver and I ordered it. So the new receiver arrives, I plug it in, wait for it to see the mouse and kb, and nothing. Nada. So I start with the basics and change out the batteries in both the mouse and kb, Still nothing. So I try a different USB port. Still nothing. Then I try it on another laptop. Nothing. So then I start looking for solutions on the web. Long story short, I found that my MK270 mouse and kb will not work with a unifying receiver. Say what? After digging around a lot, I discovered to my surprise that my MK270 mouse and kb doesn't have the Unifying symbol, and are therefore not compatible with the unifying receiver. So I came to the conclusion that there must be two different MK270 combos being sold. One comes with a unifying receiver and compatible unifying mouse and kb, and one with a non-unifying receiver and non-unifying mouse and kb. Confused yet? Me too. I don't know if this is a marketing mistake or just an oversight on Logitech's part, but the fact there are two MK270 (and possibly more) combos being sold on the market with two different USB receiver types and hardware is going to mean a big headache and lots of confusion for consumers. So unless you are already very familiar with Logitech's wireless products, and especially the differences between their unifying and non-unifying hardware and compatibility, most people are going to make the same mistake I did when it comes to purchasing a replacement USB receiver, and then become frustrated like I did when they discover it doesn't work as expected. I took my time in typing this up and explaining at length in order to inform other consumers, and hopefully to prompt Logitech and resellers into making the necessary changes to their packaging and/or documentation. It's important to make it much clearer to consumers that there are two types of USB receivers being sold, and that some hardware will not work with the unifying receivers. Bottom line and message to everyone: Before buying a replacement USB receiver, check your wireless hardware to see if it has the Logitech unifying star symbol on it. If it doesn't, it's not going to work with a unifying receiver.

I was about to return mine and write a 1-star review, thinking this was a fail! No dice on 3 mice and 2 PCs. Then I was reading comments below a 1-star review and realized: I need to load Software from the Logitech site! Somehow I'd missed that crucial info. So, if yours doesn't work, Go find the Unifying Software on the Logitech Downloads page (bottom right, presently). I know have an M570 Trackball & an M525 miniMouse work working - connected to the smallest profile USB adapter I've ever seen. My computer door can close with this device plugged in. Bonus points!

I use it for my Logitech Trackball. It works great but if you take it out and reinsert it alot (rather than leaving it plugged in all the time) the black end piece detaches. This has happened to me on 2 of the 3 that I have bought. It still works but you risk the little chip falling out. That said, I would still buy one again. They work quite well.

I purchased this unifying receiver as a replacement for my existing unifying receiver that I broke. The unifying receiver I originally had was plug and play and operated my k800 keyboard as well as my m570 roller mouse right out of the box. Unfortunately it seems that all logitech's unifying receivers that are sold separately require a software download to give them the ability to allow your devices to work. So the question is how do I download the required software for this unifying receiver from Logitech if my existing keyboard and mouse can't function until I download the new software? I'm sure the unit works fine after the software is installed but I gave three stars simply because it comes useless out of the box and if you don't have another keyboard option you're screwed. Also the web address given in the instructions takes you to a 404 page not found address.

Make sure your keyboard/mouse works with this receiver before purchasing. Some older Logitech equipment may have issues. For me, mine worked straight out of the box. I downloaded the Logi+ software, which allowed me to tailor my mouse to the settings I like.

Lost my original one and decided to find a replacement. It connects just fine to my old mouse! 10/10. Make sure your mouse is compatible before buying it tough!

I had forgotten to bring along with me the USB receiver for mouse and keyboard. I ordered this one in India with no full expectation it would work. The packet came, I inserted it in my usb port of my laptop and miracle all worked like a charm. I am thrilled with Logitech. They are a great company. Thanks to Amazon, I was able to order thsi with ZERO hassle. Thanks.

Works perfectly fine. I had misplaced my receiver for my Logitech mouse You have to download and install the unifying software for it to work Works very well

As advertised. No trouble. Prompt reply from seller and follow up.

Universal problem solver! This is all you'll ever need if you have multiple wireless peripherals at home or work.