RF transmitter and uC interface

hi every one
although i have went through another topic with the same thing but i wanted to ask the question of whether the resulting module be small enough to be contained in a hand held device
as i am trying to make a portable device which a person can carry around .
Also any suggestions on the type of uC to be used will be appreciated.
right now i am thinking of using LPC900 .
but i think that will be very small.
what i require is a low power consuming uC with 2-3 interrupts and yes transmission and reception capabilities.

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