Smart walkie talkie
"Smart walkie talkies", which, depending on the design, offer many interesting functions, are virtually predestined for outdoor use.
They are practically robust smartphones with an "Android" operating system and additional functions.
Depending on the brand and device type, the following are offered, among other things:
Smartphone with dual SIM
PTT (push to talk) button
IP 68 waterproof
and much more.
Care should be taken when selecting the different radio standards and country approvals!