The RC ESC or Electronic Speed Control for brushless RC motors.
Micro 1a Dual-way Brushed Esc Dc 5v Electronic Speed Controller Winch Control Circuit Board For Rc Model Toy Car Plane - Buy Micro 1a Dual-way Brushed Esc Dc 5v Electronic Speed Controller
30A 2-4S Brushless Motor ESC Speed Controller For RC Plane Helicopter Aircraft | eBay
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4V-16V 30A 8KHz PWM Control Electric Speed Controller ESC For RC Airplane Plane | eBay
Amazon.com: 30A RC Brushless Motor Electric Speed Controller ESC 3A UBEC with XT60 & 3.5mm Bullet Plugs : Toys & Games