They have a datasheet [0] for an "Environmental Monitoring Sensor" which lists a line-of-sight range of 50 miles and 1–3 miles in urban settings. For comparison, Digi's XBee PRO ZigBee wireless modules have a line-of-sight range of 2 miles [1]. I'm a little bit skeptical about the 50 mile range claim (seems too good to be true), but this is an interesting product nonetheless.

[0]: http://www.beepnetworks.com/img/datasheet.pdf

[1]: http://www.digi.com/products/xbee-rf-solutions/rf-modules/xb...