how long is the usb wire?

The wire is 71" long. Generally long enough however, as a low-speed USB device there are USB extension cables available out to 25'.

Is the scroll wheel notched or smooth?

The scroll wheel is smooth, but has click stops when scrolled. However, looking at the photo of the product referenced, it looks like it is notched. Mine is smooth.

What is the DPI sensitivity of the Logitech B100 Corded Mouse?

The Logitech B100 Corded Mouse has a DPI sensitivity of 800.

What type of connectivity does the Logitech B100 Corded Mouse use?

The Logitech B100 Corded Mouse uses a wired USB connection.

Questions & Answers: Logitech B100 Corded Mouse – Wired USB Mouse for Computers and laptops, for Right or Left Hand Use, Black

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Logitech B100 Corded Mouse – Wired USB Mouse for Computers and laptops, for Right or Left Hand Use, Black

A comfortable, ambidextrous shape feels good in either hand, so you feel more comfortable as you work-even at the end of the day.
With 800 DPI sensitivity, you'll get precise cursor control so you can edit documents and navigate the web more efficiently.
Side-to-side scrolling Plus zoom lets you instantly zoom in or out and scroll horizontally and vertically. Perfect for working with spreadsheets and presentations.*
Zero setup with flexible connectivity means you just plug it into your USB or PS/2 port-it works right out of the box.
This mouse is built by logitech-the mouse experts. It comes with the quality and design We've built into more than a billion mice, more than any other manufacturer.
Works With Chromebook - The Works With Chromebook badge signifies products that are certified to meet Chromebook compatibility standards, to provide you with a seamless experience.

$7^.99 –