1. Input voltage: DC10-15V (12V), DC20-28V (24V) 2. Output voltage: AC220 + -5% 3. Output frequency: 50Hz 4. Low voltage alarm: DC10V-11V (12V), DC18V-19V (24V) 5. Low voltage shutdown voltage (no load): DC10V+ -2V (12V), DC18V+ -2V (24V) 6. High voltage shutdown voltage (no load): DC15V+ -2V (12V), DC29V+ -2V (24V) 7. No load loss: less than 0.2V 8. Conversion efficiency: greater than 95% 9. Output voltage waveform: corrected sine wave 10. Power: 660W 11. Peak power: 4000W 12. Size: about 23x11x7.5 cm 13. Weight: about 1300 grams 14. Uses: suitable for all cars, wind power, solar power, pollution-free power generation, etc. 15. Features: suitable for continuous use of laptops in the car, with automatic protection against overload, overvoltage, overtemperature, and short circuit, aluminum alloy shell, durable, beautiful and lightweight, convenient and practical