ESC9800 speed controller adopts PID closed-loop control technology. It adopts international advanced technology such as SMT chip production and electronic sealant, anti-salt spray and waterproof to meet the growing requirements of engine control. Quickly and accurately respond to engine load transient changes to control engine speed. The steady-state adjustable rate is adjustable. It has droop characteristics, power indication function, reverse battery voltage protection, rich interfaces, and accurate speed control. The controller, electromagnetic actuator, and speed sensor form a speed closed-loop control system, which can control the engine to run stably at a constant speed. Material:Metal colour:Red Package Contents: 1 x ESC9800 speed controller Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.