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.

There’s been no shortage of activity around the Nothing Phone (3a) and (3a) Pro which will be unveiled on 4 March. Following an official unboxing from the Nothing team – and various other videos – there’s not much left that we don’t know.

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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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.