Tripp Lites dual input voltage SM2200RMDVTAA line interactive UPS system maintains 120V nominal output when powered by North American 120V or International 230V input. Protects a variety of computer, networking and other sensitive equipment types from blackouts, voltage fluctuations and transient surges. 3U Rack Mountable tower form factor with an installed depth of only 22.5 inches. Expandable battery runtime with optional BP48V24 2U and BP48V60RT3U external battery packs. Uninterruptible Power Supply UPS switches to battery derived AC output during power failures and extreme voltage variations.