This wireless monitoring kit allows monitoring of up to 4 cameras (With sound) from one remotely held viewer or televsion (AV out from the viewer).  The unit is easy to set up, can be left plugged into the mains or will run from the inbuilt rechargeable battery.  The range will vay with thickness of walls etc, we tried it in our office and managed to get a range of around 45m with an image on the screen.  These kits are the complete tool for monitoring your children, monitoring outdoor security, allowing remote access and many other functions.  A cheap video security option.