4 pcs. 30A ESC 2-4S Lipo Brushless 30A ESC with 5V/2A BEC for S500 X500Bullet quadcopter points:1, New Series: 30A ESC designed in professional aircraft programming software RC quadcopter multirotor 300-400 class/aircraft release.2, Good protection: adopted ultra-low internal resistance thermal safety overload protection, arming protection (prevents the motor from starting accidentally when turned on) and automatic throttle shutdown in the situation of signal loss.3, Data Details: This programmable 30A ESC with 5A/2A BEC output, support 30A continuous current, burst current (10s): 40A, 5-12NC/2-4S Lipo supported.4, lightweight: esc weight is 27g, size (LxWxH): 43x25x8mm, lighter for your aircraft. Warm Note: This 30A ESC comes without connectors.5, Friendly customer service: If you have any questions or concerns, please feel free to contact us, we will try our best to help you. Features:1. Safe power-on function: when the power is turned on, the motor will not start immediately, regardless of the throttle stick in any position, to avoid personal injury;2. Throttle travel calibration function: adapt to the throttle travel difference of different pilots, improve the linearity of throttle response, with smooth, gentle speed control and first-class linearity speed adjustment;3. Program setting items:Battery type: li-xx (lithium battery)/ni-xx (nickel-cadmium or nickel-metal hydride), the default value is li