1. Low frequency pure sine wave with Charger(HOME UPS). Never harm to any load 2. Transfer Time 10ms. Computer will not shut off when Mains off suddenly. 3. Digital control Three stage charger, improve battery life 4. With Battery Selector for charge of different battery 5. Power saver Function ( Stand by) 6. High Power Factor0.9-1, 7. Low idle current to reduce energy consumption 8. Low DC input, 1-3KW/12V (24/48) VDC, 4-5KW/24V (48) VDC, easy to arrange battery bank. 9. Big charge current, 35A-75AMP for different mode 10. Back-Feed Protection 11. Full protection, short circuit, Overload, over Temp., Battery low/high Protection 12. Fault recovery 13. LED display and alarm 14. RS232 communication function optional. Display and control product running by computer 15. SNMP Net Agent function optional, display and control product running by internet 16. Remote control cable optional 17. LCD Display is optional 18. Wall mounting