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.

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.