100% backup guarantee with no break power. Zero time transfer full static switch. Automatic detective and shutdown when no load. Generic computer interface. Input Power factor more than 0.9 at full load. Input voltage 165 Vac - 275 Vac. Output voltage 220/240 Vac ± 1%. Built in output isolation transformer. Crystal controlled frequency 50/60 Hz ± 0.1%. LED and LCD display. Surge, spike, blackout, brownout, overload and. short circuit protection. EMI/RFI and power line noise protection. Built-in sealed lead acid (maintenance free) battery. 20 kHz PWM inverter. SNMP/HTTP monitor capability (option).