What is thefunction of the button on top (above the scroll wheel)?

Toggle for the wheel between free spin (no resistance) and click-click spin

Can you press down the scroll wheel to middle click?

well I just found out that my difficult to press middle button is defective, I just went to BB, and there display 720 mouses middle button actually clicks, and is supper easy to press, so if your 720's mouses middle button is finicky, or difficult to push, then it is defective, and you should return it, good luck!

in "free-spin" mode does anyones browser slightly wander?

Wander or too sensitive is because default scroll is like 20 lines a pop. The right way is set scroll to 2-3 lines, no smooth, and let the free spin do the job.

Can this pair via Bluetooth to a smartphone like other Bluetooth mice?

Yes, the mouse can be paired via one of the 3 profiles to an android phone. Just set the mouse to pairing mode and pair it like anything else or using an OTG cable and the unifying receiver.

Brand	Logitech
Manufacturer	Logitech
Item Height	1.77 Inches
Item Width	4.53 Inches
Product Dimensions	7.39 x 11.51 x 4.5 cm; 131.54 g
Batteries	1 AA batteries required. (included)
Item model number	910-004790
Wireless Type	2.4 GHz Radio Frequency
Hardware Platform	Laptop, Personal Computer
Operating System	Linux, Windows XP, Windows 7
Average Battery Life (in hours)	12 Months
Are Batteries Included	Yes
Lithium Battery Energy Content	2 Watt Hours
Lithium Battery Voltage	1.5 Volts
Lithium Battery Weight	0.5 g
Number of Lithium Ion Cells	1
Manufacturer	Logitech
Item Weight	132 g

Logitech M720 Triathlon Wireless Modern Mouse Compatible with Laptop, Personal Computer, Black

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