Dimension? I think 8.3 x 2.3 x 7.1 inches is the packaging size?

You're right. Actual size is 4.0 x 2.2 x 1.5 inchest from LOGITECH website. I own this mouse, it's great for laptops. I reported to Amazon years ago they've listed wrong specs but they just ignored it.

Does this *really* work with Mac in a full-featured way? or in just a kind of pedestrian mouse way?

This mouse has two side buttons, a clickable scroll wheel, the scroll wheel also clicks left and right. Every function or combination of functions work perfectly with a Mac, providing you do NOT use Logitech downloadable controller. Instead, use the outstanding SteerMouse app, available as a download. A Mac user since 1984 and graphics user.

Is the scroll wheel smooth or notched? Does the wheel have any rolling resistance?

The scroll wheel is about 99% smooth as you can feel the notches if you really think about it. It has no rolling resistance but you can scroll a few lines at a time when you get used to it. That is a good thing if you want to scroll fast, but a bad thing when you try to "select" something by clicking the scroll wheel as you will probably miss it as with your finger being on the wheel, any tiny movement will make it move. My work-around to this is, if I am in the browser and want to put something into a tab, I right click the item (brings up the menu) and then hit "T" to open in a new tab. If you are in maybe a word processor and want to select a file to open, you can right click the file, bring up the menu and click on "open". I find that after you get used to doing this, it is maybe a little faster and no chance of an error (think "drag and drop" as opposed to "cut or copy and paste").Except for this one thing about the scroll wheel, I really like the mouse. Being able to turn it off without removing the sender from the computer or keyboard or hub is a big plus for me. I've had mine for 3 months now and I really like it.

is this a basic 3 button mouse? (two buttons and wheel) or is it a 5 button mouse (has two side buttons)?

This is a 3 button mouse with two extra features built into the scroll wheel. Push the scroll wheel left or right and it will go back or forward when surfing the internet on any browser. This is an excellent mouse in my opinion without the need for two side buttons for this feature. The mouse buttons are also programmable for ease of use for any user.

Average Battery Life (in hours)	36 months
Brand	Logitech
Series	M525 Wireless Mouse
Item model number	910-002696
Hardware Platform	PC, Mac
Operating System	Windows 10, 11 or later, Chrome OS, macOS 10.5 or later
Item Weight	0.16 ounces
Product Dimensions	8.27 x 2.28 x 7.09 inches
Item Dimensions LxWxH	8.27 x 2.28 x 7.09 inches
Color	Black/Gray
Power Source	Battery Powered
Batteries	1 Lithium Polymer batteries required. (included)
Manufacturer	Logitech
ASIN	B005KSAHZU
Is Discontinued By Manufacturer	No
Date First Available	September 5, 2011

Logitech 910-002696 M525 Wireless Mouse - Grey/Black

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