Digital Crown

The Digital Crown is the primary input device found on Apple Watches and also the AirPods Max. It was first released in 2015 with the original Apple Watch and is conceptually based on the watch crown that controls the of es. . Vision Pro also features a digital crown

Apple Watch
The Apple Watch crown is for scrolling, home screen and more! It has always been there. It is the first and main product to use Digital Crown? And of course, Siri. Can also change volune if in Now Playing on Apple Watch, or in Apple Music or in Apple Podcasts, and even in Apple Books.

Airpods Max
Digital crown on airpods can change volumes, end calls and more. First non apple watch device to feature a real non rumored digital crown. It can also trigger Siri

Apple Vision Pro
The upcoming Vision Pro crown can change volumes, change Enviroments Levels, make stuff bigger, trigger accessibilty shortcuts,and use Siri

Other, Third Party Devices
Non-apple devices are not made by apple, and probally are stealling ideas. They may have a Completly diffrent use, like changing volumes.

History
In December 2020, the AirPods Max became the first non-Apple Watch product to feature a Digital Crown. The appearance of the Digital Crown remained largely unchanged until September 2022, when the Apple Watch Ultra introduced a redesigned case to protect it. . Then, the Vision Pro