This is a very nice mouse
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MOUSE: This is a very nice mouse.  It looks large and has an unusual shape, but I have at most medium size hands and it doesn't feel too big. The functionality is very good as a "basic mouse" with great laser control, etc.  Frankly I rarely remember to use the special side buttons to do things like previous/last windows in a browser.  It's still a very good, top end smooth mouse even with out using every possible bell and whistle.  I use a laptop a great deal and this is the first time I've really bothered to like a mouse enough to bring on a hotel trip.BATTERY:  I understand it has an extremely high quality or state-of-the-art brand of AA rechargeable battery.  In a pinch you can use any AA battery though.  I don't know how often it needs to be recharged - probably not more than every couple weeks.  It gives you a "low battery" warning - a little PC popup - which supposedly comes on intermittently for nine days as its charge gets low, suggesting the full life must be a few weeks if the last phase of low-charge, is nine days.  (Logitech experts note the prior Revolution mouse had a built in battery, which I assume would eventually get tired.)RECHARGING:  Recharging is trivial as you just plug the supplied, or any, microUSB cable into the front.  If you use a thin microUSB cable, even if you are computing during the charging phase, it is no more inconvenience than any good corded mouse.  It gives three nice progressive (rolling) green lights on the side as it charges, progress-bar style.  As far as I can tell there is no need to use the "off" button (I think it sleeps when not touched rather than running its battery down) but the instructions aren't clear.WIRELESS.  It works with a very tiny wireless dongle.  It doesn't come with much documentation but it stores a Mouse App in the system tray (lower right corner in Windows) which has a lot of information.  Supposedly, if you get into the Mouse App, there is a "star" symbol tab option which gets you into the "Unifying Wireless" app.  In the Mouse App, click "star" tab at left then click "Open Unifying Software" and it gives you instructions to connect with other Logitech devices (typically by turning them On and Off in the proper Unifying Software mode.) 