while i'm sure those do work, you need to be careful with them. I used a similar device (for a customer), and in testing it at our house, we came across these interesting points:
1. microwave oven causes interference
2. cordless phone caused insane interference
3. wireless router caused problems
and the quality was less than desirable even when all interference was removed. Wireless may not be the best idea. It's possible more expensive units might be less susceptible to simple interference. Sorry i can't be more insightful on this one. just dont expect it to work perfect.
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