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“energy slider”
It’s a hardware control (a slider) shown in teasers for the CMF Headphone Pro, a headphone from Nothing’s sub-brand.
The company has not publicly stated what exactly the slider does.
Speculations from tech media suggest it could be used to:
• Adjust bass level or “energy” of sound
• Control the strength of active noise cancellation (ANC)
• Act as a kind of equalizer or sound “mood” control slider