IMPORTANT: Used condition, tested to ensure operational functionality, sold WITHOUT batteries, install 12V 7Ah batteries of your own choice before use, casing may show minor cosmetic wear from previous use, internal charging and surge protection diagnostic systems are ready to work right away. CyberPower CST135XLU uninterruptible power supply is a 1350VA 810W battery backup system featuring Automatic Voltage Regulation to stabilize incoming utility power and protect sensitive equipment from voltage fluctuations, brownouts, and power surges. Built in LCD display shows battery level, load capacity, and power conditions at a glance, designed specifically for home offices, workstations, and home theater setups. Offers both battery backed outlets and surge only protection outlets, plus integrated USB charging ports on the front panel to keep mobile devices powered during an outage. Compact tower design fits neatly on a desk or floor. Search terms: CyberPower UPS, battery backup.