This product adopts full electronic closed loop design.Fast and precise response to instantaneous changes.It can prevent reverse battery voltage, instantaneous voltage.Easy to install, pre-adjustable, adjustable speed work idle.High reliability and it can withstand all kinds of electromagnetic interference around the engine.: ESD5500E Speed range: 1KHz ~ 7.5KHzThermostability: Max.+1%IDLE adjustment: 16020Hz ~ 95% of rated speedDROOP adjustment: The minimum position is 15Hz +6Hz/ load current change per ampereThe maximum position is 400Hz +75Hz/ load current change per ampereExternal speed adjustment: 200Hz (external 1KQ)Color: Brown, yellowMaterial: metalPackage Contents: 1 * Engine Speed ControllerOnly the above package content, other products are not included.Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.