Features:1. Designed to control engine speed with fast and precise response to transient load changes. 2. The speed controller provides a series of protection once the power supply is reversely connected. 3. High and low speed conversion and fine speed adjustment.4. Multifunction: Automatic Parking Protection. High Speed Start. Full Speed Control. Parallel Function.5. Steady-state rate adjustment (speed drop) is adjustable.Specification:Condition: 100% Brand NewItem Type: Generator Speed ControllerSpeed Fluctuation Rate: +0.25%~-0.25%High Speed Setting Range: 1K~5kHzSpeed Signal: 1~20VRMSSteady-state Rate (speed drop): 0~5%Temperature Drift: <+5%~-5%Ambient Temperature: -40~+80 Impact: 2GVibration: <100HzRelative Humidity: <95%Fine-tuning of the Speed: Calibration Speed +200Hz~-200HzPackage List:1 x Generator Speed ControllerNote:1. Please allow slight error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard..