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40A Flyfun HOBBYWING controller for airplanes and helicopters class 400/450 3D with a good quality/price ratio. The cables are made of high quality silicone. The controller supports 2-6S LiPo batteries and has a 5.2 to 7.4V/8A switchable BEC to power your servos.V5 version:Better response time Improved battery life Lower operating temperature Adjustable HV BEC Improved protection and safety New design New cooling radiator More adjustable parameters