This XRotor 50A Pro ESC is an OPTO ESC, which means it has no 5V circuit (BEC). Most of the expensive Flight Controllers (e.g. DJI NAZA) has a BEC unit included, so many players will use OPTO ESC to save money and less work load on the ESC. However, if your Flight Controller has NO BEC included, you will need to purchase an UBEC module (5V) to power up the RC Receiver.
Special core program for multi-rotor controllers greatly improves throttle response
Auto Timing Adjustment and Preset Parameters for easy operation
DEO (Driving Efficiency Optimization) technology significantly improves throttle linearity and driving efficiency
Open Cooling Fin
Output : Continuous 50A, Burst 70A up to 10 seconds