Hidden Diagnostic Port on Apple Watch Could Allow for Smart Band Accessories [Updated] - MacRumors
Skip to Content

Hidden Diagnostic Port on Apple Watch Could Allow for Smart Band Accessories [Updated]

apple_watch_sensorAhead of Monday's media event where Apple is expected to provide final details on the Apple Watch, a new report from TechCrunch details a hidden "diagnostic port" inside one of the channels on the Apple Watch where watch bands slip into place. While the port is currently used only for diagnostic purposes, the report argues it could be used in the future to interface with "smart band" accessories bringing additional functionality to the watch.

The port has a 6-dot brass contact array inside the groove for the ‘bottom’ strap connector slot. Several sources have confirmed its existence and placement to me. It is very similar to the connector for the Lightning connector in iPhones, as that connector currently only uses 6 of its 8 available pins. Apple recently began opening up the Lightning port for use by third parties. A source says that this port is currently for diagnostic purposes only — but that there is nothing preventing it from being a connection port for future accessories.

TechCrunch's Matthew Panzarino is careful to state that he has no knowledge of any plans by Apple to launch such smart band accessories, but the idea remains an intriguing one. Possibilities for such bands include additional sensors, external batteries integrated into a band, and more.

Apple revealed a number of high-level details about the Apple Watch at the device's unveiling last September, but even now with a launch set for next month there is still much that remains unknown, including pricing details beyond the $349 starting price. Apple will undoubtedly address many of the details at Monday's events, but some of the technical details will likely need to wait until the device launches and users and technical experts can get a closer look at the device.

Update 2:13 PM: The diagnostic port will not be included on the Apple Watch that ships to consumers, according to 9to5Mac.

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

Popular Stories

iPhone 18 Pro Deep Red Feature

iPhone 18 Pro Launching Later This Year With These 12 New Features

Wednesday March 18, 2026 7:39 am PDT by
While the iPhone 18 Pro and iPhone 18 Pro Max are not expected to launch for another six months or so, there are already plenty of rumors about the devices. It was initially reported that the iPhone 18 Pro models would have fully under-screen Face ID, with only a front camera visible in the top-left corner of the screen. However, the latest rumors indicate that only one Face ID component...
Apple Logo Sketch Feature

Apple Has Now Unveiled Eight New Products This Month

Tuesday March 17, 2026 9:25 am PDT by
Apple has unveiled a whopping eight new products so far this March, including an iPhone 17e, iPad Air models with the M4 chip, MacBook Air models with the M5 chip, MacBook Pro models with M5 Pro and M5 Max chips, the all-new MacBook Neo, an updated Studio Display, a higher-end Studio Display XDR, and now the AirPods Max 2 this week. iPhone 17e features the same overall design as the iPhone...
ios 26 4 yellow

Here Are Apple's Release Notes for iOS 26.4

Wednesday March 18, 2026 11:56 am PDT by
Apple provided developers and public beta testers with the release candidate versions of iOS 26.4 and iPadOS 26.4, which means we're going to see a public launch as soon as next week. The RC versions of the software include Apple's official release notes, giving us final details on what's included in the update. Apple Music - Playlist Playground (beta) generates a playlist from your...

Top Rated Comments

144 months ago
Battery strap, here we go...

Score: 19 Votes (Like | Disagree)
Mad Mac Maniac Avatar
144 months ago


Update 2:13 PM: The diagnostic port will not be included (http://9to5mac.com/2015/03/05/apple-watch-has-a-lightning-port-for-development-but-wont-when-it-ships/) on the Apple Watch that ships to consumers, according to 9to5Mac.

Now that's the Apple that we know and "love"
Score: 10 Votes (Like | Disagree)
AleXXXa Avatar
144 months ago
Who's buying this launch day?

I'll continue to bite my tongue because I thought iPads were useless when they first launched, but now I own one.
iPads are still useless. You can't do anything special on them that you can't do on a laptop or on a smartphone.
Score: 10 Votes (Like | Disagree)
cmChimera Avatar
144 months ago
Who's buying this launch day?

I'll continue to bite my tongue because I thought iPads were useless when they first launched, but now I own one.


I am. Wait is killing me.
Score: 9 Votes (Like | Disagree)
taptic Avatar
144 months ago
But can it connect to this?



I'll be wearing it on my other arm...
Score: 8 Votes (Like | Disagree)
Rogifan Avatar
144 months ago
"Update 2:13 PM: The diagnostic port will not be included (http://9to5mac.com/2015/03/05/apple-watch-has-a-lightning-port-for-development-but-wont-when-it-ships/) on the Apple Watch that ships to consumers, according to 9to5Mac."

That's an awfull lot of engineering and manufacturing effort to be discarded. Just saying, if it exists now, it's not likely to be eliminated, even if at first it's only used for diagnostics...

The whole backside seems like a lot of engineering for just a hear rate sensor. Compare the backside of Watch to the competition:

Score: 7 Votes (Like | Disagree)