It's a client device to an LLM that can use software on your behalf, presumably running on Android and Chrome/Linux VMs that they host. You log in to their web portal, authenticate various apps as you would on your own phone, and then the LLM can do everything you can do. You can also train it to do specific tasks.
When you press the button on the side, you speak as you would type to ChatGPT, but now the LLM can do arbitrary things as you.