Ups powercom vgd-1500rm on-line,lcd,lan protection, snmp slot, 2 sockets, external battery connecto cold start function (dc power on) lightning and surge protection battery replacement warning schedule shutdown reboot hot swappable battery by user emergency power off function battery remain time display lcd display front panel optional snmp card slot wide input voltage range power factor correction manual bypass setting free run mode setting emi/rfi noise filter support usb communication multiple language lcd display on line output voltage selected true on-line technology provides all power protection pure sine-wave output with less than 3% thd fully digitized microprocessor controlled short circuit and overload protection advanced battery management (abm) automatic battery charge in ups off mode automatic diagnostics battery check rs-232 communication port with monitoring software network/fax/modem surge protection history record of power failure events upsmon plus software monitoring extended back up time with battery pack optional extension battery pack load segmentation receptacles controllable high efficiency mode selectable fan speed auto control when loads varies