Wireless Home Theater system?

I was going to buy this sound system

http://www.bestbuy.com/site/olspage.jsp?skuId=8715759&type=product&id=1200702389192

But I was wondering, is there a limit to how far the wireless speakers can be from the actuall interface? Is it also possible that the wireless speakers may interfere with my wireless internet connection (that is with my laptop)?

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