They're Pimoroni Hyperpixel 4.0 displays, 720x720 resolution with a Raspberry Pi Zero W and a 3D printed case. They don't have a backside yet 😄
Left one is TC (npub1jdg…2mys) in Kiosk mode.
Right one is a custom sats_per_dollar (npub1sat…xusd) drawing direct on the display framebuffer.