Line interactive LCD UPS UPS status display Microprocessor control guarantees and high reliability Equipped with boost and buck AVR to stabilize input voltage Built-in DC start function enables UPS to be started up without AC power supplied Smart RS-232 communication port with free download software from the internet User's replaceable battery design Auto charge even though UPS is off Auto restart while AC recovery Provides modem/phone line surge protection Provides discharge, overcharge, and overload protection USB option phase single Capacity: VA/W 500VA/300W, 600VA/360W, and 800VA/480W Input: phase single Voltage: 110/120V AC or 220/230/240V AC Voltage range: 81 - 145V AC/162 - 290V AC ±5% Frequency: 50/60Hz (auto sensing) Frequency range: 45 - 55Hz/55 - 65Hz Output phase: single Voltage (battery mode): 110/120V AC or 220/230/240V AC Voltage regulation (battery mode): ±10% Frequency: 50Hz or 60Hz Frequency regulation (battery mode): ±1Hz Output waveform: modified sine wave Power factor: 0.6/0.6/0.6 PF Battery: Battery type and number: 12V/4.5Ah x 1pc, 12V/28W x 1pc, and 12V/34W x 1pc Backup time (at a PC load with 15-inch monitor) 10 minutes, 20 minutes, and 29 minutes Recharge time 8 hours to 90% after complete discharge transfer time: typical 2 - 6 minutes LCD indicator with blue/back light The LCD will self turn-on when the UPS is functioning including in, off, charging mode and fault mode Audible alarm: battery mode sounding every 10 seconds Low battery sounding every second Overload sounding every 0.5 second Battery replacement sounding every 2 seconds Fault continuously sounding Protection: Full protection: discharge, overcharge, and overload protection