Features: The ESD5500E speed controller offer exceptionally electronic speed regulation, ensuring diesels generators maintain stable output under varying load conditions for enhances efficiency. It can control multiple engines. Fast and accurate response to transient changes. It can prevent battery voltages reversal and transient pulse voltages. Easy to install, pre-adjustable, adjustable working idle speed. High reliability, can withstand various electromagnetic interference around the engine. Specifications: Component:Metal+Plastic Size:Approx.11.5x9cm/4.53x3.54inch Model: ESD5500E Speed range: 1KHz ~ 7.5KHz Thermal stability: +1%maximumly -- Idle speed adjustment: 160±20Hz~95% of rating speed DROOP adjustment: 15Hz +6Hz per ampere load current change for minimum position - 400Hz +75Hz per ampere load current change for maximumly position - External speed adjustment: ±200Hz (external 1KQ) Working environment Working temperature: -40℃~+85℃ Working humidity: 95% maximumly Input power supply Power supply voltage: DC12V and DC24V battery systems Grounding limit: negative electrode grounding (fuselage) Power consumption: 50mA Actuator continuous current: 2.5A minimum and 10A maximumly Speed sensor signal: 0.5 ~120RMS Package Includes: 1pcs Engine Speed Controller Unit note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you donot mind befores you order. 2.Due to the differences between different monitors, the picture may not reflect the actual coloring of the item. Thanks for your understandings. Caution: The ESD5500E generator electronic speed controller is ruggedly and can be placed in a control cabinet or engine mounted unit with other specializing contr ol equipment. If water, mists or condensation may come in contact with the control, it should be properly installed. This will allow fluid to drain from the speed control unit.