The SANTAK Robust R650 is a 650VA Offline UPS. It offers you reliable power protection against 5 of the most common power problems (power failure, power sags, power surges, under and over voltage) that threaten your equipment and data. This offline UPS is equipped with two-step Boost and one-step Buck AVR to stabilize the output voltage. Voltage fluctuations are automatically corrected using the AVR. The SANTAK Robust R650 provides you with satisfying reliable performance and maximizes the flexibility for your system integration. This UPS comes with a wide input voltage range between 140~300V which complies with the generator. It has a built-in DC start function that enables UPS to be started up without AC power supplied. It supports auto charging even though the UPS is off. It can also auto restart while mains recovery. It can deliver full protection against over-discharge, overcharge, and overload. The SANTAK Robust 650va UPS will provide 15-20 mins backup time if the electricity shuts down. It features 1x 12V/7Ah Sealed lead-acid, maintenance-free battery and it takes 2-4hours to recharge 90% capacity. The SANTAK Robust R650 comes with 2 years warranty. Under the following conditions, the warranty would not be provided:• UPS burning due to thunder, abnormal overload, insect entrance and others.• If ambient temperature should not be maintained at 20 to 26 degrees Celsius with proper dehumidification. (24/7)• If the product is placed in a dusty and damp place.• In the absence of Generator connectivity Without proper battery charge, the warranty will be void.• Battery swelling and overcharging due to the wrong system voltage setting of the UPS.