The ConnectPort X2e Smart Energy gateway RF distance information can be found in the following specifications page under the Xbee ZB SMT column: http://www.digi.com/products/xbee-rf-solutions/modules/xbee-digimesh-2-4
 

Indoor/Urban Range

200 ft (60 m)

Outdoor/RF Line-of-Sight Range

4000 ft (1200 m)

This applies to both the coordinator and router models.