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You have until Feb 1, 2017 to return or exchange items purchased between Nov 1, 2016 and Jan 1, 2017. All other standard return policy conditions apply.
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The Main Control Board for Runner 250 from Walkera is a mini computer in charge of aircraft functions. It processes user input from the transmitter (radio controller) and, after taking into account sensor data, translates this input into signals sent to the motors.