Feature: 1. MAIN PURPOSE: The speed control unit is an all electronic device designed to control generator speed for fast, precise response to transient load change. 2. CLOSED LOOP CONTROL: When connected to a proportional electric actuator and providing a magnetic speed sensor signal, will control engine in sync or droop mode. 3. GOOD PROTECTION: With protection against battery reverse voltage, transient voltage, accidental actuator short, speed sensor signal or loss of battery power. 4. WORKING RANGE: The power supply voltage is DC12‑24V, the frequency setting range is 1000‑7000Hz, and the speed sensor signal range is AC1‑50V, 85‑8500Hz. 5. PLASTIC SHELL: The generator controller shell is made of ABS plastic, has good toughness, wear resistance and aging resistance, with a long service life. Specification: Item Type: Generator Speed Controller Model: ESD2210-12 Material: ABS Maximum Output Current: DC 4A Frequency Setting Range: 1000-7000Hz Speed Sensor Signal Range: AC1-50V, 85-8500Hz External Frequency Adjustment Range: ±300Hz Idle Speed Adjustment Range: Set speed -3800Hz to -1300Hz. Package List: 1 x Generator Governor 1 x User Manual Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.