Input voltage levels for XBee

I need to use an Series 1 XBee module to Directly Read inputs and transmit to a receiver..
I need to supply both analog and digital inputs.
What are the max and min voltage levels XBee can accept?
What other stuff I should concern implementing this?

Thanks.. :slight_smile:

What are the max and min voltage levels XBee can accept?

Max = 3.3V.
Min = 0.0V.

What other stuff I should concern implementing this?

Sensor type, current, speed...