This kit, as noted on the page, is just the NexDock,[1] which itself is essentially a DisplayPort-over-USB-C or mini-HDMI 13" 16:9 1080p touchscreen display on a fold-over hinge, keyboard, trackpad, speakers, micro SDXC reader, headphone jack, and 44Wh battery in a 1.2kg laptop shell.

The NexDock is $299 and its desktop mode features are already compatible with several Samsung, Huawei, Motorola, and a few other Android phones with video output. Since it's basically just a display, it also works with any USB-C/HDMI device, including Raspberry Pis, Steam Decks and other PCs, Nintendo Switches, etc.

Purism charges $40 more and adds a magnetic mount (if not this $15 mount on Amazon,[2] then one very similar to it) and USB-C cable.

1: https://nexdock.com/explore-nexdock/

2: https://www.amazon.com/Magnetic-Desktop-Monitor-Foldable-Por...