PhreakNIC 26 Electronic Shelf Label Badge
Battery-less ZBD shelf-label badge with per-attendee firmware images
PhreakNIC 26's official electronic badge reused dead-battery ZBD 55c-RB electronic shelf labels as 3D-printed pager-styled badges with static 240x96 one-bit displays, QR-code-backed attendee customization, and on-site reflashing.