POWERWALK VI 850 SE FR Power Walker UPS
- Topology: Line-Interactive
- UPS W: 480 W
- UPS VA: 0.85 kVA
Power Walker VI 850 SE 
A Line- Interactive UPS offers  backup function and automatic voltage  regulation (AVR). AVR regulates  voltage to the appropriate level by  decreasing it during surges or  swells or increasing it during a sag or  burnout. The advantage is a  better protection for sensitive IT- and  household equipment and avoids  damage caused by voltage up- and  downturn. 
 AVR function also  benefits the battery lifetime. As long as voltage  level is not lower  than 70% to 90%, or higher than 110% to 125% AVR will  adjust voltage to  normal level. I case the voltage drops to a lower or  higher level, the  UPS will directly switch to battery mode to avoid  dropouts and damage  of the connected equipment.
Full specification: http://www.powerwalker.com/datasheet/Line-Interactive/PowerWalker%20VI%20650%20SE-FR.pdf