Read the statement by Michael Teeuw here.
Tips on powering the Pi
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 I am just looking for others ideas on how to power the PI and monitor, so that I only have one power cord going down the wall. Thanks! 
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 Monitor cord and pi power supply are stored inside the mirror housing 
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 I use one of these: NextGadget 3-Port USB Desk Charger. USB ports are powered strongly enough for the Pi, and it powers the monitor via the AC plug. Only downside: the cord itself is only about 4 feet long. So if your mirror isn’t going right over an electrical outlet, you may have to wire in an extension cord yourself. 
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 Just to give an alternative to what others are saying: my monitor has built-in USB ports, and I’m powering my pi from that just fine. So the only cord I have is the single power cord going into the monitor. 
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 @Atheose Which monitor are you using? 


