Designed a Raspberry Pi Zero 2.4 ghz RF Transceiver hat. Using it as a gateway for low power outdoor sensors. This is the first prototype, I've since made an improved circuit but
Raspberry Pi 4 Modelo B 8GB | Online Canarias
MessengerPi - A LoRa messenger and walkie-talkie based on Raspberry Pi RP2040 (Crowdfunding) - CNX Software
IQAUDIO PI-CODEC ZERO AUDIO HAT
Build a Walkie-Talkie With a Raspberry Pi & 3D Printing | All3DP
WALKIE044BL. Conjunto de walkie-talkies con base de carga 8 canales 7km - Tecnoteca