For weeks, there has been surrounding the Nothing (3a) series, which includes two phones set to be officially announced on Tuesday, March 4. One of the company’s teasers has focused on a new button, the purpose of which has remained a mystery until now.

Details about the side button on the Nothing Phone (3a) have emerged. It seems that the "Essential Key" provides quick access to AI features, to help you snap, save and recall information and ideas. There’s been no shortage of activity around the Nothing Phone (3a) and (3a) Pro which will be unveiled on 4 March.

A leak claims Nothing's new Phone 3a button will be called the Essential Key, which activates its new AI suite of Essential Space features. Users can snap photos, capture voice notes, and more through various key pressing functions and the AI will "sort" and "categorize" them for you.

The Nothing Phone 3a and 3a Pro will be officially announced on March 4, but there won't be much left to reveal. Not only has Nothing teased the phones a few times, there's also a new video highlighting the Nothing Phone 3a Pro's design.

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What's left to find out about the Nothing Phone 3a and 3a Pro? After this latest leak... (insert Nothing pun here)

A tipster has helped Smartprix uncover the mystery behind the new physical button on the Phone 3a series. According to the outlet, the button is a dedicated key for activating Nothing’s custom AI. This button is apparently the “Essential Key” and it is linked to an AI-powered hub known as Essential Space.”

Pro is launching soon with a new design and upgraded features. Here are four reasons we think the smartphone could stand up the “Pro” name.