These 900MHz NG receivers have a better signal range and are less affected by interference. Duplex RSAT 900MHz NG receivers use the latest LoRa module technology. The 900MHz NG receivers are intended as a backup system if the 2.4GHz main system fails due to external interference. This significantly increases the safety of your RC model. They are designed for operation with JETI DC/DS transmitters fitted with the optional 900MHz NG module, such as DS12, DS14 II, DS16 II (not with DS24). Note that the receivers RSAT 900 and RSAT 900 NG are not compatible! All AU spec Jeti radios will only transmit in the 918-926 MHz band. 900 Mhz receivers purchased overseas will NOT work with AU spec Jeti transmitters.