Ball Grid Array (BGA) layered PC board technology allows for a very small size. WFSS (Wireless Frequency Setting System) allows frequency changes to be made from the transmitter. Synthesized receiver allows switching to any channel in 72MHz band. PCM G3 2048 resolution, dual conversion. One year limited warranty. This receiver will only work with the Futaba 14MZ, 12MZ and the FX-40 transmitters.