These are a great little set of wireless video senders and remote control extenders. Tried a much more expensive set from Argos that didn't work well at all. These are simple to set up and use the higher 5.8GHz signal so that wi-fi computers don't interfere with the picture, which is crystal clear with stereo audio. If you order these online then you get free delivery as well. You can also add additional reciever units for £29.99 each.