If you want to build something similar, this seems like a good place to start: https://hackaday.io/project/169103-low-power-esp32-handheld
Re:Flipper Zero – Tamagochi for Hackers
by GeertJohan on Thursday July 30, 2020 @10:29AM
(#23998579)
That's pretty cool! I also backed Flipper Zero so hopefully will have the device in feb 2021 :D
I really like that it's extensible, has a battery and contains so much features for a compact device. Great multi-tool for me as a maker / hardware/software developer.