RFbee lists 868-915 as what it uses which is not a band I think is available anywhere in the world as a continuous band.
How wide are the channels? do you know what can be used in variuos parts of the world? I would be worried about it being swamped by the virtually adjacent 850 and 900MHz mobile bands.
Also can it be used like an Xbee to send its analog inputs periodically to another unit?