UPDATE (Mar 25, 2018):In my original review (scroll down) I mentioned that I had given a designer mouse to a friend. A couple of wks back it came up and I told him that mine had broken (described below on Mar 25, 2017). When I asked him if he still used the one that one I'd given him, he said that it had stopped working affter about 6 months. He said that it had simply stopped turning on. Wish I could give this no stars.UPDATE (Mar 05, 2017):MOUSE WILL BREAK! Purchase keyboard by itself, BUT MOUSE WHEEL WILL BREAK!I received this item on Jan 07, 2017. I used it for 2 and a half wks before posting my original review (Jan 25th). I am updating my review and downgrading this product from the original 5 stars to 1 star because the mouse wheel stopped working.Originally, wheel movement was very pronounced. Every small increment up or down let you know that you were, in fact, turning something mechanically. This morning, all of the sudden, the mouse began to slide freely, feeling detached. There was absolutely no resistance and no response on screen when it was moved.LOOKED UP THIS ISSUE AND IT TURNS OUT TO BE VERY COMMON! These items are sold as a set or individually. I went to the mouse's page and looked through a few pages of 1-star reviews and found that MOST WERE COMPLAINTS ABOUT BROKEN MOUSE WHEELS!I took the mouse apart (had a pic, but apparently I can't show the mouse's guts) and noticed that the axle side that slides into the sensor was broken (see pic). I AM NOT THE ONLY PERSON TO EXPERIENCE THIS! IT IS COMMON! And if you use a computer as much as I do, IT WILL BREAK ON YOU!I have owned dozens of mice, and never had an issue like this.I put the mouse back together and will simply have to work around this. Thinking about crazy gluing the wheel axle to the sensor, being that the "Return window closed on Feb 6, 2017" (1 month ago).Once again, I put my trust in Microsoft and end up being ripped off!----------Here is my ORIGINAL REVIEW:For non-Linux users:This has become my favorite keyboard and mouse. They both look really nice and I haven't had any issues whatsoever.The mouse has an on/off button on the underside. Blue light indicates mouse is on. I ALWAYS use the mouse in favor of the touchpad (even when on the move) and it's performed well on a variety of surfaces. The mouse fits the hand perfectly, no cramping after hours of use. Love the wheel.The keyboard seems to turn off when idle (good for increasing battery life). Press any key to wake it back up. It is light and small enough that I carry it w/ me wherever I go. Would be AWESOME if it had back-lit keys.For Linux users:I've run Linux as my primary OS on my laptops for almost a decade. I purchased an MS Designer mouse last year but could not connect it to the laptop I was using at the time. I ended up giving it away to a friend. I loved the design, the size, and how it felt to hold. I couldn't wait for the opportunity to repurchase if I ever got hardware to which it could connect.A couple of months ago I purchased a new laptop w/ working Bluetooth. I purchased this combo a couple of wks later... I'm going on almost a month of using this keyboard & mouse and I love them.My current computer: http://amzn.to/2ktE5UJMy current OS: Fedora 25 KDEEvery button on keyboard works, except for the 4 buttons at the top-right (looks like search, refresh, settings, and another I can't ID). I have never found use for the rewind, play/pause, or forward buttons on ANY keyboard so haven't tested them but volume and brightness work.