Operating voltage range XBEE Pro S2C module


i am working on one xbee project using XBP24CZ7SIT-004 xbee pro s2c module.
The Datasheet says working voltage of module is 2.7 to 3.6V volt. but giving supply less
than 2.7 volt like 2.4 volt my xbee module works fine.

So my concern is that will xbee module can create any problem in future or will show
unreliable behavior at this working voltage or working on less than 2.7 voltage can only limit
transmission range.