USB Type 'B' Female connector. The 4 connection pins have .1" spacing allowing it to be inserted into development boards and perf boards with mild modification. You can either drill two 80mil holes for the support posts, or cut them off completely.
This skill defines how difficult the soldering is on a particular product. It might be a couple simple solder joints, or require special reflow tools.
Skill Level: Noob - Some basic soldering is required, but it is limited to a just a few pins, basic through-hole soldering, and couple (if any) polarized components. A basic soldering iron is all you should need.
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Not out of poor design but simply due to high use. It is a good idea to have a spare in the bin when one fails. Also nice to have a usb socket to port into a project box.