As Im just trying it out for the first time, I realize that you have to use your iPhone as the monitor because the main feature is that it will place a phone call as soon as the baby wakes up.
It would be very smart to allow FaceTime calls so that an iPod touch or iPad could be used as the monitor as well; dont know of anyone that would leave their cellphone on the babys crib.
Will rate higher when this gets implemented.
Ricardo Cavenecia about Baby Monitor & Alarm, v2.7.2