"iPhone 15 Pro's Low-Energy Chip Enables Solid-State Buttons and Off-Power Features"

The iPhone 15 Pro and Pro Max will reportedly use a new ultra-low energy microprocessor that will allow certain features, such as the new capacitive solid-state buttons, to remain functional even when the device is powered off or the battery has run out. The new chip will replace Apple's current super-low energy mode and will power the solid-state buttons, including an "action" button that replaces the mute switch, when the phone is on, off, or the battery is depleted. The new low-energy capacitive features are currently being tested, and the iPhone 15 Pro is also rumored to be gaining a software-customizable button in lieu of the mute switch.