The 3A-UBEC is a switch-mode DC-DC regulator supplied with a 2-6 cells lithium battery pack (or 5-18 cells NiMh /NiCd battery ) and it outputs a consistent safe voltage for your receiver, gyro and servos. It is very suitable for RC helicopter.
Compared with the linear mode UBEC, the overall efficiency of the switch-mode UBEC is higher.