The RF04/400 uses the LPRS EasyRadio ER400TRS module which operates at 433-4MHz. The frequency allocations between 433-4MHz are Pan European and also extend to South Africa, Australia & New Zealand.
The RF04/900 uses the ER900TRS module for EU (868-870MHz) or USA (902-920MHz) markets. Power output up to 10mW. NOTE restrictions in USA to 1mW and 5mW EU
