You Can Build Your Own ESP32 Walkie-Talkies - Hackster.iohttps://www.hackster.io/news/you-can-build-your-own-esp32-walkie-talkies-99e571317536
Tech Talkies used a pair of ESP32 boards and ESP-NOW to build custom, 3D-printed walkie-talkies with a 200m range.