Engine: 4-stroke OHV petrol engines, which are air-cooled.Starting Systems: Depending on the specific model, they offer recoil (pull) start or electric key start.Power Outputs: Common models available in this design include:2.5kVA (3800A): Features a 2.5kW max output and a large fuel tank for roughly 8 hours of runtime.3.0kVA (4000AE2): Offers a 3kW power output with a 230V voltage rating.5.5kVA to 8kVA: Heavy-duty variants designed for larger home backup or commercial needs.Safety & Controls: Standard features include a voltmeter, circuit breakers, AC/DC outputs, and a low oil shut-off sensor to prevent engine damage.