433mhz is like the 'household band' here in NZ. Garage door openers, some earlier 'smart' home devices, RC toys, Arduino and other DIY type modules.
I picked up some Peltors with ambient listening ear pro also, mine had inbuilt mic with 10 channels. Sold over the counter from 'Blackwoods Safety'. I asked around about the legality and the general consensus was 'all good' provided you don't increase the transmit power of the device
https://nzsafetyblackwoods.co.nz/en/...f-each--436435
*edit - spelling and punctuation
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