Description This product adopts full electronic closed loop design.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.Model: ESD5500E Speed range: 1KHz - 75KHzThermostability: Max.and1%IDLE adjustment: 16020Hz - 95% of rated speedDROOP adjustment: The minimum position is 15Hz and6Hz/ load current change per ampereThe maximum position is 400Hz and75Hz/ load current change per ampereExternal speed adjustment: 200Hz (external 1KQ)Color: Brown, yellowMaterial: metalPackage Contents: 1 x Engine Speed ControllerOnly the above package content, other products are not included.Note: Light 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. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.