Feature: This product adopts full electronic closed loop design. It can control a wide range of engines. Fast and precise response to instantaneous changes. It can prevent reverse battery voltage, instantaneous pulse voltage. Easy to install, pre-adjustable, adjustable speed work idle. High reliability and it can withstand all kinds of electromagnetic interference around the engine. Specification: Model: ESD5111 Speed control unit: IEZ68-842 Speed stability: better than ±0.25% Speed range: 1KHz-7.5KHz Thermal stability: up to ±1% IDLE adjustment: 160±20Hz-95% of rated speed DROOP adjustment: Minimum position is 15Hz ± 6Hz / load current change per ampere Maximum position 400Hz ± 75Hz / load current change per ampere External speed adjustment: ±200Hz (external 1KQ) Package list: 1 * Engine Speed Controller Note: The actual product color may deviate from the photo due to light. There may be a slight deviation in the measurement of product.