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 Defective battery protection Battery polarity reverse connected protection Humanistic charging indicator USB chargers Fax/modem/tel protection port User replaceable batteries Surge, spike, and lightning protection (customized option) Intelligent UPS power management software (customized option) Global voltage customization: 220V/230V/240V/110V/115V/120V Specifications: Input: AC 165V - 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 - 40 degree Celsius Operating humidity: 10 - 90% RH, non condensing Power: 500V A/650V A/800VA Measurement and net weight: 200 x 123 x 320mm, 6.50Kg (UPS-500RM) 200 x 123 x 320mm, 6.50Kg (UPS-650RM) 200 x 123 x 320mm, 7.40Kg (UPS-800RM)