These walkie talkies have worked very well for me so far. I made them wet, dirty, cold and hot but the quality didn't change. I've used them to contact friends off-road up to 5 miles. No further testing was done, but the description says it should work at an even further distance depending on the conditions. I did a lot of research and have come to the conclusion that this is the best value for money Revain at the moment. I recommend this product.
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