Hi Tiggerlinda,
We have the angelcare monitor with the two sensor pads (you can get one with one or two pads) - I love it and it is one thing I could not live without, it just gives you that extra piece of mind.
At the start I would get up in the middle of the night and pick up bubs and forget to turn it off and get all the way down the hall and it would alarm - you soon learn to turn it off
Highly reccomended.