Will this hook up via internal laptop bluetooth? I have a mouse that uses the Logitech unifying receiver but need to free up a USB port. Thanks.

Yes, that is how I use it most. Then I connect to a second computer via the USB receiver and switch between them with the button on the bottom.

Is this a tilt wheel? As in can I click the top wheel left or right?

No , that is not a tilt wheel. You can click on that., it depends on your configuration of the software.

Yes it can. It's easily done through Logitech's Options software. There are actually over 40 possible commands you can assign to this button.

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Logitech MX Master Wireless Mouse – High-precision Sensor, Speed-Adaptive Scroll Wheel, Easy-Switch up to 3 Devices - Meteorite Black

Unique thumb wheel: for horizontal navigation and advanced gestures
Easy connections for multiple computers: use with up to three Windows or Mac computers via included Unifying receiver or Bluetooth smart wireless technology
Easy switching between computers with the touch of the button
Tracks virtually anywhere - even on glass: the dark field sensor tracks flawlessly even on glass and high-gloss surfaces (4mm minimum thickness)
Advanced power management: up to 40 days of power on single charge. You can get enough power for a full day of usage in only 4 minutes, with No downtime while recharging. Wireless technology : Advanced 2.4 GHz wireless technology
Note : In case of Wireless mouse, the USB receiver will be provided inside or along with the mouse

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