There’s a link in the post to the website which has an FAQ, and the first question is yours. Their answer:
Beepy is a portable computing device, with a beautiful high contrast, high resolution display, and a tactile keyboard + touchpad, it is the ultimate everyday hacking gadget.
Powered by the Raspberry Pi Zero W (or any other compatible SBCs), you can use it as a chat device (supporting all chat networks on Beeper e.g. iMessage/WhatsApp/Signal/etc. ), or use it as a hackable handheld cyberdeck, running any Linux application that runs on the Pi.
I fucking hate that piece of shit Trump, but even his arrest records in Georgia put him at 6’2”, which is by no means short. There are so many truths you could use to belittle that man, but his physical height is not one of them.