The 3A-UBEC is a switch mode DC/DC regulator, it outputs a consistent safe voltage for the receiver, gyro and servos.It is very suitable for RC helicopter and other RC models especially when the built-in BEC in the speed controller has a very limited output capability.1 Specification1.1 Output Voltage: 5V@3A or 6V@3A (Selectable by using a jumper connector)1.2 Continuous output current: 3 Amps1.3 Input: 5.5V-26V (2-6S Lipo or 5-18 cells NiMH /NiCd)1.4 Size: 43mm*17mm*7mm (L*W*H)1.5 Weight: 11g2 Features2.1 Uses an advanced switch mode DC-DC regulator IC.2.2 The output is powerful enough even working with 4S to 6S Lipo battery.2.3 Battery polarity reversal protection.2.4 A metal shield and a filter significantly reduce the electromagnetic interference.2.5 The working status is shown by an LED, it lights when the UBEC works normally.