Here's how the dedicated physical button called Essential Key will work on Nothing Phone (3a) series
Briefly

On March 4, Nothing will unveil the Nothing Phone (3a) and Phone (3a) Pro, both equipped with a dedicated camera button known as the Essential Key. This button enhances functionality by allowing users to take quick actions like capturing screenshots, recording voice notes, and accessing an AI-powered storage app called Essential Space. Although this app is still in development, it will debut with the new phones, with a more complete version likely accompanying the upcoming Nothing Phone (3).
The Nothing Phone (3a) and Phone (3a) Pro will unveil on March 4, featuring the Essential Key, a camera button that activates advanced AI capabilities.
The Essential Key serves multiple functions: capturing screenshots, recording voice notes, and accessing stored content in Essential Space with simple presses.
Read at GSMArena.com
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