I just took my first pix & video! Not exactly cinematic quality, unless you're making a movie about a dubious acid trip, but that's OK. Now I've got a camera for my experiment (seeing where my cat goes when I let her out) and I won't be out much money if she immediately scrapes it off her harness under somebody's car somewhere. But it took some patience! Better info on this product page could have saved me at least a week.
First and foremost, people need to know that THIS ONE DOES NOT COME WITH A MICRO-SD CARD. IT WON'T WORK WITHOUT IT, SO GET ONE NOW. "Frequently Bought Together" is NOT explicit enough and it's certainly not obvious from the picture. There are something like 20 variations of this camera on the market with identical housings and names, and many of them DO come with micro-SD cards. Of those, a fair number reportedly come with FAKE micro-SD cards. Whether that means "a no-name card with a forged trademark" or "a piece of plastic painted to look like a micro-SD card," you're probably better off buying one separately that you know is good - but it sure would help to know up front that you need to do that.
Next, as the webpages about these cameras seem to agree, people need to know that !! this is a hobbyist thing !! It is NOT a "consumer item" by typical US & EU standards (i.e., "everything you need is in the box with understandably written instructions, and it will almost certainly work, and there's someone you can yell at if it doesn't"). Apparently nobody knows who makes these things because nobody puts their own trademarks on them. I imagine various Asian middle schools ordering The Ubiquitous Housings, collecting scrap chips from local factories, and building these cameras as fundraising items. Hey, it's more educational than selling band candy! The instructions are good for a giggle at the quasi-poetic translation, but that's about it. However, if you search the Web for "808 Car Key Camera" there are some good instructions, including videos, that got me up and running; thanks, you guys!
So if you have time, and you like to tinker, learn, have adventures, and gamble a little, buy this camera with both eyes open and have fun! If you're on a strict deadline, your brain is full with other stuff, and failure is not an option, you might want to dig between the sofa cushions for some more money to buy something a little less feral.