BEC = battery eliminator circuit ie, on 1/10th cars the power for the servo/receiver comes from the main battery and eliminates the need for a separate receiver pack. Such a high torque servo would normally be used in a 1/8th nitro car I'm guessing and they of course have a dedicated receiver battery pack to run the servo as they don't have a battery for the motor (unless you have a new fangled electric 1/8th of course).
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