Random trajectory flying disco eyeball chopper.

This thing manages to be cute, fun and dangerous at the same time. It's like a remote control helicopter, except they replaced the helicopter bit with a disco ball and there's very little control where it goes. This results in much hilarity with friends when it randomly attacks them.
The run time is impressive for such a small lithium cell, and it recharges fairly quickly via the supplied USB charge lead.
The circuitry is predictably well-tuned for a mass produced product, and the ground proximity sensing and motor stall detection are well implemented. The small amount of circuitry is text-book.
Note that the unit seems to respond to infrared remote codes. Mainly decelerate and stop, then start again while LEDs remain lit.
Here's a general purpose eBay search link for these fun devices:-
https://www.ebay.com/sch/i.html?_from=R40&_sacat=0&LH_BIN=1&_nkw=flying+disco+ball&_sop=15
Guide price should be around $4, so ignore the first few listings that give an unrealistically low price for some completely unrelated product.
If you enjoy these videos you can help support the channel with a dollar for coffee, cookies and random gadgets for disassembly at:-
http://www.bigclive.com/coffee.htm
This also keeps the channel independent of YouTube's advertising algorithms allowing it to be a bit more dangerous and naughty.