If your scared to buy this because you have to modify it, dont be.  It was really easy and there is even a video on youtube on how to do this [...]After I modified it, it worked great.  Easy to pair with my iphone 5 and it works even while my iphone was charging in my bedroom and the receiver was in the living room.The unit itself is super tiny and after I connected it all I just hid it in the back of the TV & stereo among the other wires.Also if your worried about this thing not having a auto off or power button, it only uses 5 volts DC @ 1 amp.  For comparison USB ports use 5 volts DC @ 2.1 amps, its not much to get excited over.  If you are that much of a penny pincher, you should probably be using a power strip to turn off your TV, DVD Player, Stereo, etc... also since those things all suck power while not in use.Thanks everyone for your comments.  Its what makes buying from Amazon great! 

Question: How much is the margin to achieve an optimal line of sight?
Answer: do nt be