Feature: 1. The unique 50A ESC, as long as you plug in the battery, the motor will start immediately. 2. Easy and convenient for installation, reliable and durable to use. 3. Waterproof, can be used for underwater thruster, RC boat model, etc. 4. Block PWM signal, power on to turn, slow start after 5 seconds to reaches the maximum speed. 5. Wonderful replacement for the old or broken one, directly fitment. Specification: Condition: 100% Brand New Item Type: ESC Material: Electronic Components Color: Black Voltage: 7-24V Continuous Current of ESC: 50A Maximum Current: 60A (within 10 seconds) Drive Mode: Block PWM signal, power on to turn, slow start after 5 seconds to reaches the maximum speed Usage: No potentiometer, throttle, remote control required Purpose: Underwater thruster, boat model accessories This unique 50A is technically not supposed to be called an electronic speed controller. It doesn't have a signal line, so it can't adjust the speed of the motor, just plug in the battery and the motor will start immediately.The brushless controller can be used in some devices that do not require speed regulation. Block PWM signal, power on to turn, slow start after 5 seconds to reaches the maximum speed. Package List: 1 x 50A ESC