Walkie talkies?
Mobile phones?
Matches wood and a blanket and for smoke signals?![]()
From what and to what? What are the inputs/outputs on the devices?
Ah, I see. Is there a wifi equivalent transmitter/receiver combo that would give better range?
Something like this perhaps:
https://www.amazon.co.uk/Audiomate-3-5mm-Wireless-Transmitter-Built/dp/B00B7ID99S
Never used one, mind and it reckons 30m range.