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Amazon.com: Hobbypower SimonK 30A ESC Brushless Speed Controller BEC 2A for Multirotor Quadcopter(4 Pack) : Toys & Games
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Amazon.com: QWinOut 2-4S 30A RC Brushless ESC Simonk Firmware Electric Speed Controller with 5V 3A BEC with 3.5mm Female Banana Bullet for 2 to 4s Lipo Battery, DIY Multicopter Quadcopter (30A,1 pcs) :