Hobbywing 2-6S Platinum-30A-Pro OPTO brushless motor ESC Electronic Speed Controller for RC Multirotor, Aircraft and Helis,especially for Multi-rotor aircraft High performance microprocessor, best compatibility with all kinds of motors, highest driving efficiency. Optimized for multi-rotor aircraft. Smooth, linear, quick and precise throttle response.User programmable. Multiple protection features: Low-voltage cut-off protection / Over-heat protection / Throttle signal loss protection. The firmware of the ESC can be updated through the built-in USB adapter in the Professional LCD Program Box. Multiple program methods supported: transmitter stick, Digital LED Program Card, Multifunction LCD Program Box, Professional LCD Program Box, PC software. Very easy to program the ESC at home or at the flying field.