The much-awaited LG G5 is set to be unveiled this Sunday, a day before the Mobile World Congress (MWC) officially kicks off. Now the Korean electronics giant has revealed that its upcoming flagship smartphone would arrive with “powerful Hi-Fi audio features.” LG had partnered with B&O PLAY, a unit of Danish audio-visual company Bang & Olufsen, for the technology.

LG G5 To Sport 'Powerful Hi-Fi Audio Features' From Bang & Olufsen

Samsung to show off its new phones the same day

Without providing many details, LG Electronics said it worked closely with B&O PLAY to let G5 owners enjoy “the best sound experience” on the phone. The G5 will be LG’s first smartphone to feature Bang & Olufsen audio technology. LG’s rival Samsung is also gearing up to unveil its flagship Galaxy S7 and S7 Edge smartphones the same day.

Besides audio enhancements, the LG G5 will bring several new features. Qualcomm confirmed earlier this week that the device would be powered by its latest Snapdragon 820 SoC. It is said to have a 16-megapixel main camera, 3GB RAM, 32GB of built-in storage, Android Marshmallow, and a 5.3-inch QHD display. But what would make it LG’s “most premium handset till date” is a Magic Slot.

Magic Slot to be the biggest highlight of LG G5?

The LG G5 is said to have a Magic Slot that will allow users to swap in and out different modules to expand the phone’s functionality. The company will launch several independent plug-in modules and accessories with its flagship smartphone that will be collectively called “G5 and Friends.” Users will be able to control the hardware modules using an app called LG Friends Manager.

One of the modules in a leaked image, LG Cam Plus, includes a zoom dial, camera shutter button, and flash toggle. It also packs a 1,100mAh battery. LG is expected to highlight at the event some of its partners who are making such modules. Last week, LG put out a press release showing a new Quick Cover for a “smartphone that does not officially exist,” pointing to the G5.