Features 1、This product adopts full electronic closed loop design. 2、Fast and precise response to instantaneous changes. 3、It can prevent reverse battery voltage, instantaneous pulse voltage. 4、Easy to install, pre-adjustable, adjustable speed work idle. 5、High reliability and it can withstand all kinds of electromagnetic interference around the engine. Specification Features: This product adopts full electronic closed loop design. It can control a wide range of engines. Fast and precise response to instantaneous changes. 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: ESD5500E Speed range: 1KHz ~ 7.5KHz Thermostability: Max.+1% IDLE adjustment: 160±20Hz ~ 95% of rated speed DROOP adjustment: The minimum position is 15Hz +6Hz/ load current change per ampere The maximum position is 400Hz +75Hz/ load current change per ampere External speed adjustment:±200Hz (external 1KQ) Weight: Approx.600g/ 21.2oz Package List: 1 * Engine Speed Controller Note: Please allow slight error due to manual measurement. Thanks for your understanding. Package List