Micro USB cable

OTG cable, if you would like to use the badge with your mobile phone (Wikipedia)

Portable Display Screen Equipment, ideally with selected software pre-installed

external power bank

external antenna (Antennas)

LEDs (WS2812B LEDs) (8 LEDs per badge, see RGB LEDs for details)

something to cover the light sensitive chip (the silver shiny bar below the display) on the display (e.g. a dark permanent marker, nail polish, or a dark sticker)