$25 low power dev board with solar: Rak4630 (now included in regular builds)

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In my country (UK) and much of Europe you are limited to 10mW on 433Mhz:

Whereas you can do 500mW on 869.4-869.65 MHz

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In either case, you are also limited to a 10% duty cycle. I believe this is the same throughout Europe?

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