You're not seeing double. Both these screens belong to one phone, the ZTE Axon M. Available on AT&T in the US for $725 (which converts to about £538 and AU$953), this phone features two displays that fold out.
Each display measures 5.2 inches. When folded out together, it makes for a 6.8-inch display.
The Axon M bends outward, with the hinge on top.
This is what it looks like all closed up.
Given the two screens, the phone is thick, and measures 0.48 inches (12.19mm) on its side.
It's really thick.
It charges through USB-C.
Here it is from the top.
Yes, you spotted that right; there is a headphone jack.
A look at the phone from its side when the second display is folded out.
The back with the phone laying completely flat.
Another look at the back and the mechanisms that fit the two screens tightly together.
The phone also features a microSD card slot (sorry, no second SIM).
All the controls are on the left side.
There is also a quick-launch key that can long press to open any app of your choosing. Double tap it and it launches the camera.
You can swap viewing modes by pressing the M on the control.
One mode is mirroring, which allows for both screens to display the same content.
Flip it like a sandwich board and two people can look at the same website, photos or video at the same time.
Or use two completely different apps, each on its own screen.
It works in both portrait and landscape orientations.
This mode is ideal for multitasking. For instance, looking up a location in Maps while reading an email.
You can swipe with three fingers to switch the apps from one screen to the other.
Open it like a tablet and you can expand a single app, like a game, to fill both screens.
Another look at the expanded mode.
There is a single 20-megapixel camera on the "main" screen.
If you want to use the camera as a point-and-shoot, you'll have to flip the phone over first.
But you can use the same 20-megapixel camera to take selfies too.
Another closeup look of the camera lens and flash.
The phone is powered by a Snapdragon 821 chipset and a 3,180mAh battery.
It comes with 64GB of internal storage and 4GB of RAM. You can expand the memory up to 256GB.
It runs Android 7.1.2 Nougat at launch.
Another look at the phone's backside.
In the US, the Axon M is an AT&T exclusive. At about $725, it also costs about the same as some flagships now like the Pixel 2, iPhone 8 and Galaxy S8. For more info, read CNET's review of the ZTE Axon M.