Features: Automatic voltage regulation Emergency power backup protects your valuable data and computer hardware Short0circuit and overload protection Cold start function Overcharge and over-discharge protection Smart audible and LED icon alarms Fax/modem/telephone protection port User replaceable batteries Surge, spike, and lightning protection (customized is optional) Intelligent UPS power management software (customized is optional) Global voltage customization: 220, 230, 240, 110, 115, and 120V Specifications: Input: AC 165 to 275V Output: AC 220V +/- 10% Frequency: 50Hz Transfer time: < 10ms Battery: 12V/7.0Ah sealed lead acid battery Charging time: no more than 8 hours Operating temperature: -5 to 40 degree Celsius Operating humidity: 10 to 90%RH, non-condensing Power: 500VA, 650VA, 1KVA, 1.2KVA Measurement and net weight: UPS-500SD: 155 x 85 x 330mm, 6.50kg UPS-650SD: 155 x 85 x 330mm, 6.50kg UPS-1000SD: 195 x 120 x 300mm, 13.20kg UPS-1200SD: 195 x 120 x 300mm, 13.20kg