Apple Watch Series 3 Prototype May Show Contacts for Potential 'Smart Bands'

Apple may have tested "Smart Bands" for the Apple Watch, according to a new image of a prototype device.

apple watch series 3 contacts prototype
The image, shared by developer and prototype collector Giulio Zompetti, shows two metal contacts inside an Apple Watch Series 3 prototype's band slot, either side of the diagnostic port. Zompetti postulated that the "two unusual pads are exposed to the band," and may be a kind of iPad-like "Smart Connector," much like those from various iPad models, used to accommodate a "Smart Band."

Apple has filed a large number of patents around smart Apple Watch bands, indicating that it is something that the company has actively considered. Some patents showed how features such as biometric authentication, self-tightening, and LED progress indicators could be integrated into a band, while others explained a modular approach with batteries, displays, cameras, blood pressure sensors, and more.

The Apple Watch's hidden diagnostic port was once speculated to facilitate Smart Bands. At the time, the diagnostic connector, which is purportedly based on the design of the Lightning connector, was said to be capable of supporting future accessories.

Third-party accessory makers were able to develop an external battery band that could charge the Apple Watch through the diagnostic port, but changes to the Apple Watch's software prevented the strap from ever coming to market. However, other smart bands not reliant on the diagnostic port have become available in recent years.

In the past, Zompetti has shared images of prototype versions of the original Apple Watch, first-generation iPad, third-generation iPod touch, and iPhone 12 Pro.

Related Roundup: Apple Watch 11
Buyer's Guide: Apple Watch (Buy Now)

Popular Stories

iOS 26

When Will Apple Release iOS 26.2?

Monday December 1, 2025 4:37 pm PST by
We're getting closer to the launch of the final major iOS update of the year, with Apple set to release iOS 26.2 in December. We've had three betas so far and are expecting a fourth beta or a release candidate this week, so a launch could follow as soon as next week. Past Launch Dates Apple's past iOS x.2 updates from the last few years have all happened right around the middle of the...
maxresdefault

iPhone Fold: Launch, Pricing, and What to Expect From Apple's Foldable

Monday December 1, 2025 3:00 am PST by
Apple is expected to launch a new foldable iPhone next year, based on multiple rumors and credible sources. The long-awaited device has been rumored for years now, but signs increasingly suggest that 2026 could indeed be the year that Apple releases its first foldable device. Subscribe to the MacRumors YouTube channel for more videos. Below, we've collated an updated set of key details that ...
ios 18 to ios 26 upgrade

Apple Pushes iPhone Users Still on iOS 18 to Upgrade to iOS 26

Tuesday December 2, 2025 11:09 am PST by
Apple is encouraging iPhone users who are still running iOS 18 to upgrade to iOS 26 by making the iOS 26 software upgrade option more prominent. Since iOS 26 launched in September, it has been displayed as an optional upgrade at the bottom of the Software Update interface in the Settings app. iOS 18 has been the default operating system option, and users running iOS 18 have seen iOS 18...
Sad Siri Feature

Apple AI Chief John Giannandrea Retiring After Siri Delays

Monday December 1, 2025 2:16 pm PST by
Apple AI chief John Giannandrea is stepping down from his position and retiring in spring 2026, Apple announced today. Giannandrea will serve as an advisor between now and 2026, with former Microsoft AI researcher Amar Subramanya set to take over as vice president of AI. Subramanya will report to Apple engineering chief Craig Federighi, and will lead Apple Foundation Models, ML research, and ...
Netflix Smaller 4

Netflix Kills Casting From Its Mobile App to Most Modern TVs

Monday December 1, 2025 4:36 am PST by
Netflix has quietly removed the ability to cast content from its mobile apps to most modern TVs and streaming devices, including newer Chromecast models and the Google TV Streamer. The change was first spotted by users on Reddit and confirmed in an updated Netflix support page (via Android Authority), which now states that the streaming service no longer supports casting from mobile devices...
Touchscreen MacBook Feature

Here Are the Four MacBooks Apple Is Expected to Launch Next Year

Monday December 1, 2025 5:00 am PST by
2026 could be a bumper year for Apple's Mac lineup, with the company expected to announce as many as four separate MacBook launches. Rumors suggest Apple will court both ends of the consumer spectrum, with more affordable options for students and feature-rich premium lines for users that seek the highest specifications from a laptop. Below is a breakdown of what we're expecting over the next ...
iphone 17 cyber

iPhone 17 Demand Is Breaking Apple's Sales Records

Tuesday December 2, 2025 9:44 am PST by
Apple's iPhone 17 lineup is selling well enough that Apple is on track to ship more than 247.4 million total iPhones in 2025, according to a new report from IDC. Total 2025 shipments are forecast to grow 6.1 percent year over year due to iPhone 17 demand and increased sales in China, a major market for Apple. Overall worldwide smartphone shipments across Android and iOS are forecast to...
Cyber Week Deals 2025

Best Cyber Week Apple Deals Include Big Discounts on AirPods, Apple Watch, and More

Sunday November 30, 2025 7:33 am PST by
Cyber Week is here, and you can find popular Apple products like AirPods, iPad, Apple Watch, and more at all-time low prices. In this article, the majority of the discounts will be found on Amazon. Note: MacRumors is an affiliate partner with some of these vendors. When you click a link and make a purchase, we may receive a small payment, which helps us keep the site running. Specifically,...
iOS 26

What to Expect From Apple This December: iOS 26.3 Beta, Replay 2025, and More

Monday December 1, 2025 8:40 am PST by
The calendar has turned to December, and the quieter year-end holiday season is now upon us. Nevertheless, we can still expect a few things from Apple this month. Apple previously announced that iOS 26.2 will be released to the general public in December, and we can expect corresponding updates to be released as well, including iPadOS 26.2, macOS 26.2, watchOS 26.2, tvOS 26.2, and visionOS...
iOS 26

Apple Seeds iOS 26.2 and iPadOS 26.2 Release Candidates to Developers and Public Beta Testers

Wednesday December 3, 2025 10:33 am PST by
Apple today seeded the release candidate versions of upcoming iOS 26.2 and iPadOS 26.2 updates to developers and public beta testers, with the software coming two weeks after Apple seeded the third betas. The release candidates represent the final versions of iOS 26.2 and iPadOS 26.2 that will be provided to the public if no further bugs are found during this final week of testing....

Top Rated Comments

Mac Spec Avatar
58 months ago
Former Apple Retail employee here - early Apple Watches were "imaged" via a hardwired connection through those ports. The tool was black plastic with pins that matched up with what is shown in the photo. These were used for the watches in the display table table - the ones not touched by customers.
Score: 10 Votes (Like | Disagree)
jz0309 Avatar
58 months ago

Fair, but how about a battery that lasts a full day?
My AW4 when new lasted me 2 days…
It all depends on your usage…
Score: 6 Votes (Like | Disagree)
easy4lif Avatar
58 months ago
I’m actually surprised apple never allowed or introduced smart bands. Extra battery, more sensors, health monitor.

such potential!
Score: 5 Votes (Like | Disagree)
subi257 Avatar
58 months ago

A band that gives you one week battery life would be nice.
But you would need one for both arms so that one doesn't look wimpy compared to the one with the 3lb battery.
Score: 3 Votes (Like | Disagree)
fwmireault Avatar
58 months ago
Imagine trying to update your smart bands firmware on your S3, and you don’t have enough storage to update

oh wait…
Score: 2 Votes (Like | Disagree)
apparatchik Avatar
58 months ago

Wishful thinking…
It is literally a wish, my SE already lasts me 2 days, so the band would just have to provide two times the built-in battery, not a stretch per se...
Score: 2 Votes (Like | Disagree)