Tripp Lite's LR1000 automatic voltage regulation system offers complete protection from brownouts, overvoltages and transient surges for computers, printers, fax machines and more. Transformer-based voltage correction circuits maintain usable 220-240V nominal AC output during brownouts as low as 168V and overvoltages to 278V. Network grade equipment protection offers AC surge and noise suppression. Supports heavy loads up to 1000 watts. Includes 4 NEMA5-15R outlets, 2m-line cord and 7 diagnostic LEDs that display incoming voltage level, surge protection status and line fault conditions. 2 year warranty.