A:AnswerIt's 100% after 30 min in more than 5 meters of water that's anyone's guess. This device floats unless you strap it to something heavy. I went trekking with this strap to by pack which was holding about 4 pounds of gear. I left the pack on the side of a stream which took it away down a water fall didn't have any problems once I recovered it and the pack are 100% waterproof.
A:AnswerThey are powered by your stereo receiver or the out put from a theater system or such. I found should not be hook in line with each other takes away from the sound.I also found an outside use volume control switch on the popular bidding site.
