Having just broken our current monitor 
, I'm in the market for a new one! The Motorola mpb36s seems to be the updated version of the mpb36, but I'm a bit confused because you don't seem to be able but additional cameras for it, even though it says it can take up to 4 cameras. Does anyone know if there are additional cameras for it or are they compatible with the old mpb36 cameras? Also, anyone who has it can you tell me is it possible to split the screen to see 2 cameras at the same time? Hoping someone can advise - thanks!