Logitech K780 Multi-Device Wireless Keyboard

I recently purchased a couple of Mini PC's to handle a number of tasks both for business and personal uses which are amazing little machines, however, soon after I got them I realized that I had not taken into account the frustrations of having to connect and disconnect my old USB keyboard! At first I was just going to purchase a regular Logitech Keyboard with a Unify dongle as I have always been pleased with them in the mice I have. But then I realized I would still have to connect and disconnect the Unify Dongle to each PC as well. So I started looking for Bluetooth keyboards because they would be much easier to switch between. That was until doing some searching and found that they had a few keyboards which could support multiple devices via Bluetooth! I purchased this one as it was one of the few which was priced where I could afford it and even better it was a full size keyboard with a number pad.As soon as I received it I unboxed it and took the battery cover off to take the little plastic tab (battery saver) from between the 2 AAA batteries which are included, so I could get to trying it out. To my surprise it was NOT just Bluetooth but it also came with a Unify Adapter! Now that was a pleasant surprise because at the time, one of my MiniPC's which sadly I had to return because of many issues (be careful buying refurbs) did not have Bluetooth, so I thought I would have to purchase a Bluetooth adapter for it, but with this keyboard coming with the Unify Dongle, it allows me to connect this keyboard to 3 Bluetooth PC's and use the Unify Adapter for everything else! I was not expecting the Unify Dongle and perhaps I did not read the description very well, but I don't recall it mentioning that,I have now been using the keyboard for a bit and setting it up with the 3 MiniPc's was a piece of cake, very simple and had no issues at all. It easily switches between each device with the touch of a button, and takes a couple of seconds to reconnect (only need to pair once). One really nice feature is that after a couple minutes of no use, the keyboard will go into battery save mode, then when your ready to type again, only takes but 1-2 seconds to start typing again. While some might think that would be a hassle, when you consider how much battery this will save, it's easily over looked. The manufacture Logitech states that they batteries should last 2 years in one of their other Bluetooth keyboards which I also purchased for my other misc devices, so I would have to imagine that using Bluetooth alone and not the Unify adapter, I should get similar results from this, but only time will tell. Though I am only using the batteries that it came with right now, and who knows how long they have been sitting in the device before i purchased it and they are generic batteries. I am guessing I won't get that long, however, if I get a few months out of the 2 batteries which as much as I use it, I will be impressed none the less. When switching from PC to PC you simple hit the white button at the top that corresponds to the device that you pair the keyboard with and within 3 seconds, the keyboard is connected to that device and your ready to start typing away.The only down side that I have found is that I can not find the one key that I use a lot, and I was unable to find it on the Logitech support site nor in the manual online for this keyboard, is the Print Screen button. It's usually on the right side top of most keyboards or in the number pad somewhere, but I can't find it. I looked on Google and couldn't find an answer their either so I will have to send an email to Logitech support to find out where it is, but again, this is a minor inconvenience for now, but at least I know there is an easy solution for that once they respond and let me know.With a couple tiny inconveniences that are really low on my list of issues I have ever had with technology gadgets I have ever purchased, I am very happy with the purchase of this keyboard and I recommend this to anyone who needs a Bluetooth keyboard and needs the ability to connect to more then 1 device. It's incredibly well made, and had some weight to it, so you can tell it's not just some cheap piece of plastic keyboard, It has a nice no slip bottom which holds on to any surface you use it on, and it is constructed with an incredibly useful holder on the top which is where the white strip is which was designed to hold your portable devices like a mobile phone or tablet. Since I am not using it with those devices, I find it very useful for holding everything from pens and credit cards (perhaps I use that last one too much) to pieces of paper like a password list and even a notepad which I need to read from while working. It is a great keyboard and I am glad I choose this one over some of the other brands I was looking at and while it cost a little more then the others, Logitech is in my mind the absolute leader in mice and keyboards, and once again, they did not let me down! (PS- This keyboaard is a perfect match when purchased with their Multi Device (3 devices) M720 Bluetooth mouse which also comes with it's own Unify Dongle! Both paid via Bluetooth to 3 devices, and both have their own Unify Dongle. If you download Logitech's Unity app, you can actually pair both the keyboard and mouse to the same Unify adapter since each dongle can pair with up to 6 Unify capable devices. They are a match made in heaven!I hope this helps someone who might be looking for this type of a solution because had I read a review from someone else about these, I would not have spent 3 days of endless searching, which ultimately, I am glad I did and got this pair!

This is long-term owner's review. I own this keyboard since 2018, when I bought it along with M720 mouse. I bought them specifically for multi-device functionality to switch between my personal and work laptops when working from home.Keyboard itself takes some time to get adjusted to, after years of using more traditional, larger keyboards. For me, the hardest part was that arrows are right below Enter and Shift buttons - when writing text I often hit the area to the upper left side from arrows, where Enter supposed to be. Also, having F-keys as a secondary action that requires pressing Fn button is annoying sometimes, but I don't use those keys much.I like the design of round keys, I find that key action is good enough and not worse than any compact keyboard. The phone/tablet stand was not useful a lot for me. I don't use tablets, though, and I imagine it's helpful to put a tablet into the stand if the tablet doesn't have it's own stand. Battery life was great. I think I had to change batteries once since 2018. Overall, I'm satisfied with this keyboard.Now why I decided to write this review after 4 years using a keyboard? It kept well over the years, but the mouse I used with it got the soft cover material deteriorated. I wanted to replace the mouse with the same model, and keep the keyboard, and 2 USB dongles I was using with my laptops. Unfortunately, the new mouse came with C-U0008 USB receiver, and the old mouse and keyboard from 2018 had C-U0007. Now, despite that new mouse was exactly the same model as old one, and all those products advertised to be compatible with "unifying" receivers, they are not. Old K780 keyboard is not compatible with new C-U0008 USB receiver, and new M720 mouse doesn't work with old C-U0007 receiver. Logitech, this is a really bad way to s.... customers. There is a kind of a workaround - use Bluetooth instead of RF, but it doesn't connect instantly, there is a few seconds gap between the moment you press switch button and when the keys start working on another device. It's not much of a deal, but it's very annoying, especially as I have to use it because of Logitech's fault to keep the "unifying" receiver ecosystem really unifying. Also, this will not work for everyone - not all desktop PCs have Bluetooth.Now I either have to live with laggy Bluetooth connection or buy a new keyboard with C-U0008 USB receiver to have my setup working again. Or I'd rather return the new M720 mouse and get Dell or some other brand making multi-device keyboards.UPDATE: Changed 4 star to 5 stars because all compatibility complaints above are wrong. Unifying receiver works as it should, it's just not that straightforward to re-pair existing devices from old to new receivers. You need some kind of software that can trigger "unpairing" of device from old receiver so it can be paired again on the same channel with the new receiver. For Windows I used "Logitech Unifying Software" and for Linux I used "Solaar".