Features: Automatic voltage regulation Emergency power backup protects your valuable data and computer hardware Short circuit and overload protection Cold start function Over charge and over discharge protection Smart audible and LED icon alarms Fax/modem/telephone protection port User replaceable batteries Surge, spike, and lightning protection (customize option) Intelligent UPS power management software (customize option) Global voltage customization: 220V/230V/240V/110V/115V/120V Specifications: Input: AC 165 to 275V Output: AC 220V ±10% Frequency: 50Hz Transfer time: < 10ms Battery: 12V/7.0Ah sealed lead acid battery Charge time: no more than 8 hours Operating temperature: -5 to 40 degree Celsius Operating humidity: 10 to 90% RH, non condensing Power: 500VA Measurement and net weight: 227 x 98 x 220mm, 5.30kg (UPS-500N)