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.

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.

The bar looks quite reminiscent of Google's old Pixel 7 Pro as it pits its primary and ultrawide lenses together, but provides a separate cutout for its telephoto. The device Nothing is teasing might follow that same trend as it displays three total lenses in a more minimalistic manner.

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While the Phone (3a) Pro retains signature Nothing elements like the Glyph Interface and transparent back, the redesigned camera system and overall design reflect evolution, aiming to stand out from the crowd, as stated by Nothing's Design Director.

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.