Live: Apple debuts iPhone Duo, its first foldable iPhone

Driving the news: The iPhone Duo features an inner display 80% larger than its next-largest iPhone and supports Apple Pencil. An under-display front-facing camera supports video chat, with two traditional cameras on the back on the phone.

• In demos, Apple showed how it redesigned its own apps to fit the new shape, while also highlighting how programs like Slack are using the added space.
• Apple also touted various techniques it employed in an effort to make Duo more durable than other foldables on the market.
• There are batteries on each side of the phone, which Apple says can provide all-day battery life.
• The iPhone Duo starts at $1,999 with 256GB of memory. Pre-orders start Oct. 16 and it will ship Oct. 23, Apple said.

Before turning to Duo, Apple announced the iPhone 18 Pro and iPhone 18 Pro Max as well as updates to Apple Watch and AirPods.

• The phones are powered by a new A20 Pro chip, with a 7-core GPU that Apple says can improve graphics performance by up to 30%.
• Apple is promising best-ever battery life of up to 24 hours on the 18 Pro and up to 30 hours per charge on the 18 Pro Max.
• On the camera front, the new phones have a 48-megapixel main camera with variable aperture, a first for the iPhone.
• The 18 Pro starts at $1,199 and Pro Max at $1,299 and will come in black, silver, glacier and burgundy.
• A new iPhone Handoff feature allows people to share a single phone number across two iPhones. T-Mobile and Verizon will be among the first carriers to support the new feature.
• The company also updated its AirPods earbuds. Apple touted the new $129 AirPods 5 as more durable while including noise cancellation at the same price as the prior entry-level model. A version with wireless charging, longer battery life and the ability to change volume from the stem are priced at $149.
• The devices will start shipping to customers on Sept. 18, with pre-orders starting this Friday.

The new Apple Watch Series 12 and Apple Watch Ultra 4 feature new processors along with added health, fitness and AI features.

• Among the health features is more frequent heart rate monitoring, while new AI options include sound awareness that can detect a doorbell, siren or other noises.

• Apple Watch also supports new recording features that don't save raw audio, but do allow a person to get key information from conversations. A "live rewind" feature provides a brief transcript of a recent conversation, while Siri Recap takes high-level notes on meetings. Those features will be in beta later this year.
• Apple Watch Series 12 starts at $399, while Apple Watch Ultra 4, with its larger battery, starts at $799. Both will be available starting Sept. 18, with pre-orders starting today.

The big picture: Apple kicked off the event with new CEO John Ternus greeting the crowd.

• "When I first walked through those doors 25 years ago, I never could have imagined a moment like this," Ternus said, "But what I did know even then, there's something really special about this place."

Between the lines: Even as it debuted the first of its new phones, Apple focused on the updated version of Siri, which draws on models from Google.

• Apple began the event with Ternus talking about his vision for AI turning the iPhone into "an intelligent personal hub."
• The company did highlight that some server-based features will have rate limits, with additional usage available to those with a paid iCloud plan.

What we're watching: How Apple manages to add new capabilities to its lineup while also dealing with rising memory and component costs.

This story is developing.