Hi @Souxie,
Welcome to the Roku Community!
We are more than willing to provide you with further details on how to identify the Roku Streaming Stick as a 4K device.
Looking at the device's serial number will not help you identify whether it's a 4K or not, except if it's already activated and connected to a television. In that case, you can check it through Settings > System > About.
The model number is on the back of the device, and it should be 3820R2.
For more details and to get to know more about the Roku Streaming Stick 4K, please visit our Roku store website: The Roku Store
We hope you find this information helpful.
Regards,
Riamie
Riamie D.
Roku Community Moderator
