1、Designed to control engine speed with fast and accurate response to transient load changes. 2、The speed controller provides a series of protection once the power supply is reversely connected. 3、This engine speed controller allows for 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, and the adjustment is very simple. Item Type: Engine Speed Controller Product Model: S6700E Speed Range: 1K-7.5KHZ Speed Fine-Tuning Range: ±200HZ Speed Fluctuation Rate: +0.25%~-0.25% Speed Signal: 0.5~120VRMS Steady-State Rate (Speed Drop): 0~5% Temperature Drift: < +5% ~ -5% Ambient Temperature: -30 ~ +70 degrees Vibration: <100Hz Relative Humidity: <95%Function: 1. Speed Control 2. High and Low Speed Conversion and Speed Fine-Tuning 3. Automatic Parking Protection 4. Adjustable Steady-State Rate (Speed Drop) 5. High-Speed Start 6. Full Speed Regulation 7. Parallel Function 1 x Engine Speed Controller 1 x User Manual