the card: tap the arrow for the next friend, the name for a thread, ≡ for friends. Lines are chips. The right key (or `) opens the five lines for whoever is on the screen; the two on the left (▲▼) change friend without a hand over the glass.
the old slab, for comparison: space next friend, ↵ open thread, ▲▼ friends, ← back, and type to write.
usb-c plugs the held card in. The light on its bottom edge is amber while it charges and dark otherwise; it never lights for a message. Watch the power row.
dance makes the holder dance: after ~20 s the card locks its keys and holds chirps until the song ends
compass set off: the arrow goes and the ring says closer or farther. Walk them toward someone, and turn them away: ranging reaches much less far behind a body.
under cover drops GNSS on the held card: no arrow, but ranging still gives the distance. hang it stops the firmware: note how convincing the paper stays until the watchdog cuts the rail.
Press the right key twice to buzz whoever is on the screen. In the festival scene it is night: the first touch only lights the panel.