A:AnswerYes, They REALLY float and are totally waterproof and yes the range is great out in the open. We used them on a cruise ship and had service through walls, doors etc as well as when one was on the ship and the other was in the port.
A:AnswerSeriously??? No. They are great walkie talkies but nothing about them would suggest that they would withstand any type or electro magnetic pulse. In fact, I'd venture to say a good lightning strike could disable them.