$8 endoscope off eBay front view only, the focal length was too long to focus for a side view. My first was very clear, the next on not so much so I bought a Teslong.
First eBay scope;
Second eBay scope after the first one gave up the ghost.
Yes, that is the one. You have to download software for the eBay scopes, Windows 10 and Macs recognize you Teslong scope, no software needed.
I do have a friend who bought the Teslong scope and his smart phone didn't recognize it so he had to use his wife's laptop with Windows10 to view the pictures.