This wireless baby monitoring kit allows monitoring of up to 4 cameras (With sound) from one remotely held viewer or Television (Viewer has AV Out).  The unit is easy to set up, can be left plugged into the mains or will run from the inbuilt rechargeable battery.  It also features night vision so you dont need to leave a light on.  The range will vay with thickness of walls etc, we tried it in our office and managed to get a range of around 25m with an image on the screen.  These kits are the complete tool for monitoring your children, and not just by sound like normal baby monitors.