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.

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.