LCD Front Panel Display (EN750LCD EN900LCD)USB Communications (Except EN350)Hot Swappable BatteriesEasy Battery AccessRJ1145 NetworkPhoneFax Protection3-Year Electronic Parts and Labor, 2-Year Battery Warranty From ManufactureTransformer-friendly receptaclesDC Startup capabilityIndependent Battery BypassAudio & visual AlarmsECO Mode (EN900LCD)$50, 000 Manufacture Platinum Protection Plan (US & Canada Only)Compatible with Minuteman SentryHD Management SoftwareLCD Display Provide Real-Time Information (750900 Models)