China's Oppo has joined the list of phone manufacturers with a foldable smartphone in their lineup.

The ????? ?????? ?????company's first-ever folding phone is called the Oppo Find N. According to Oppo, it's the result of four years of research and development, and that it comes after six generations of prototypes.

In a blog post, the company detailed some concepts behind the smartphone. There's nothing that sounds revolutionary here; Oppo says a modern foldable smartphone has to be beautiful, powerful, with an "appropriate" weight and size, as well as easy to use, both when folded and open. The company says it has "solved the main pain points in previous foldable smartphones," including the display crease and overall durability of the device.

A teaser video shows the device in action; it opens up horizontally, like a book, and has two displays, one on the outside, with a punch-hole selfie camera on top, and a bigger one the inside, with another punch-hole selfie camera in the upper left corner. It looks a lot like a shorter version of Samsung's Galaxy Z Fold 3.

The entire announcement was only a teaser; the company hasn't shared any actual specs of the device, merely saying more will be revealed on Dec. 15.

However, leaker of smartphone things, @evleaks, followed up by sharing many official-looking stills of the Oppo Find N, which tell us a bit more about its features. In the photos, we can see that the phone has a triple rear camera, placed together with a flash module in a sizable bump. We also get to see the phone in three different colors: white, dark grey or black, and purple.