Tripp Lite's SU16000RT4UHW SmartOnline Hot-Swappable Modular Rack/Tower UPS System provides 16,000VA (16kVA) on-line, double-conversion UPS support for server, network and telecommunications equipment. 4U power module and 4U external battery pack installs in 8 rack spaces (8U). Maintains full-time sine wave output within 3% of selectable 208/120 or 240/120V AC. Corrects brownouts and overvoltages from 65V to 140V (L-N). Network management interfaces include combination DB9 RS-232 enabled and dry contact serial port, enhanced USB port and SNMPWEBCARD slot. HID-compliant USB interface enables integration with built-in power management and auto-shutdown features of Windows and Mac OS X. Includes PowerAlert monitoring software and complete cabling. Front panel LEDs and LCD readout with scroll controls support visual monitoring of all major UPS functions. Split-phase, four-conductor hardwire input. UPS supports hardwire output.