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ZMR 40A Bidirectional Brushless 2-6S UBEC 3A 5V ESC for Remote Control Car Pneumatic Underwater Propeller E-951 Bidirectional 40A 2-6S ESC UBEC 3A 5V. It can be used in cars, ships, underwater thrusters. No need to calibrate throttle stroke, plug and play. Bidirectional 1:1 power output, no brake, direct reverse, quick response, good handling.