The OnePlus 2 will retail for a bit more at $389 -- which converts to around £350 or AU$533 -- for the 64GB version. The 16GB model will only retail later in the year for $329.

On the left is the original OnePlus One, and the OnePlus 2 on the right isn't any larger or smaller, though it's a lot more polished.

The design elements, such as the raised screen of the OnePlus One, are retained in the sequel. It also has 5.5-inch full-HD display.

Another look at the raised display of the OnePlus 2.

The phone is powered by a Qualcomm Snapdragon 810 processor and has 4GB of RAM.

The 13-megapixel rear camera of the OnePlus 2 comes with laser-assist focus just below the lens.

The 13-megapixel rear camera also comes with dual-LED flash, an f/2.0 aperture and a larger sensor for low-light shots. It also has optical image stabilisation.

The Alert Slider is a new feature that lets you set how bothered you want to be. There are three modes: all notifications, priority notifications, and no notifications.

The OnePlus 2 will use a USB Type-C port, and buyers of the phone will never have to worry about which way is the right way to plug a USB cable in. There's also a fingerprint sensor.

A closer look at the USB Type-C port.

The dual-SIM card slot is located under the cover. There's also an embedded 3,300mAh battery.

The phone isn't the thinnest on the block at 9.85mm, but the thickness does have a reassuring grip to it.

A view from the side in sandstone black.

Pocket size? What do you think?

You can buy four different after-market backings if you want.

In addition to the sandstone shade, the backplates come in bamboo, sandstone, black apricot (a type of wood, believe it or not), rosewood, and Kevlar.

A quick peek at the OxygenOS that rides on top of Android 5.1.

Another view of the side.

Comparison between the original OnePlus One and OnePlus 2.

The home screen.

OnePlus One and OnePlus 2.

Another look at the alert slider button.

The OnePlus 2 (black) has its camera mount lower because the sensor is larger.

One last look. Check out our hands-on OnePlus 2 impressions!