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this units are working and in good condition batteries hold charges. (2) NEMA 5-15R (Battery Backup) Input voltage range for main operations Input voltage adjustable range for mains operation Maintenance-free sealed Lead-Acid battery with suspended electrolyte : leakproof Alarm when on battery : distinctive low battery alarm : configurable delays Surge Protection and Filtering Full time multi-pole noise filtering : 5% IEEE surge let-through : zero clamping response time : meets UL 1449 |