... _10% 3)super wide input frequency range from 40HZ-70HZ Home UPS function :Uninterruptible power supply solve the problem caused ... load, it will turn on the unit automatically. With battery reverse polarity protection, low-voltage input protection, over-voltage input protection ... TV sets, air-condition, fans, refrigerators, motors, wind generator, solar system and so on,8) 4 steps AVR, 220v+_10%, three ...