Crazepony 4pcs Littlebee 20A Mini ESC Oneshot125 Electronic Speed Controller 2-4S Brushless for FPV Multicopter Quadcopter Littlebee 20A ESC is a super compact,lightweight,high performance speed controller for your racing multi-rotor.Pre-flashed with BLheli and ready to use with Oneshot (aka oneshot125PWMsync)mode via compatible flight controllers running Cleanflight or similar. These ESCs do not have a BEC, you will need to supply 5v power to your flight controller with a UBEC or stepdown voltage regulator. Littlebee 20A ESC is using Silabs processor and fast dedicated driver chips,providing excellent freewheeling and exceptional braking capabilities. More RC racing Quad-copter product is provided by Crazepony on Amazon.Bring your eyes into the sky and racing like a free bird, enjoy the ultimate first person view experience.