Enspire® Series: standby UPS, 550VA/300W, 120VAC input & output, voltage range 95-140VAC, (4) on-battery receptacles, (4) surge-only receptacles, 3 min. full load, 11 min. half load, wall mountable, USB comm-port, phone/fax/modem line protection, SentryHD software (via free download), Independent Battery Bypass, Tool-less battery replacement, Hot-swappable battery, 3-yr Warranty/2-yr. battery warranty, Energy Star certified, RoHS compliant