The long-rumored Lumia 950 and Lumia 950 XL are finally here, marking the first flagship phones preloaded with Microsoft’s new Windows 10 operating system. The Lumia 950 XL sports a 5.7-inch display, while its smaller counterpart has a display of 5.2 inches.

Microsoft Corporation Unveils Lumia 950, 950 XL

Lumia 950 XL features liquid cooling

Both new Lumia phones feature what Microsoft calls “tablet class liquid cooling.” This feature enables them to run on more powerful chips. The Lumia 950 XL also has a 20-megapixel rear-facing camera and a “Triple LED RGB natural flash,” according to Microsoft. The company claims that the feature will enable users to take photos that look well-lit. The 950 XL also sports optical image stabilization, 4K shooting capabilities, and a side camera button, which is sure to appeal to photography fans, reports The Verge.

The Lumia 950 XL comes standard with 32 gigabytes of storage, although there’s also a microSD slot so that it can be expanded. Microsoft has also equipped it with Type-C USB charging connectors and an octa-core processor.

The phablet also supports Windows Hello, which enables users to just log in using a scan of their face, which is one of the newest features added in Windows 10 Mobile. In a divergence from the fingerprint scanners that have become popular in premium smartphones, Microsoft is instead opting for infrared iris scanning, reports Ars Technica. The iris scanning capability is in beta right now but also uses Windows Hello.

It will also feature Continuum, which lets users turn it into a PC using a dock and connecting a monitor, keyboard and mouse.

Lumia 950 very similar to 950 XL

Many of the features on the Lumia 950 are the same as the ones on the 950 XL, although one difference is that the smaller model runs on a hexa-core processor. Another difference between the two phones is that the 950 XL sports a slightly bigger battery at 3300 mAh, while the 950 has a 3000 mAh battery.

Both have the same 20-megapixel camera and flash designed to eliminate red eye. They also both start at 32 gigabytes of storage, which can be expanded up to 256 gigabytes, and support for Qi wireless charging and Qualcomm rapid charging. Both phones will also have models with dual SIM available.

Microsoft will make both Lumia 950 phones available for purchase starting next month. The Lumia 950 is priced at $550 to start, while the Lumia 950 XL starts out at $650.