Automatic Voltage Regulation keeps output voltage within acceptable user selectable levels Graceful shutdown using serial or USB cables via PowerChute Serial Shutdown User-selectable low voltage setting of 100V-127V Add up to 10 external battery packs (SMX120BP) Short depth UPS provides extra space for cable management Ideal for servers, storage, networking & commercial applications 3kVA/2700W line interactive pure sine wave 4U rack/tower UPS (rail kit AP9625 sold separately) Helps save energy - designed to limit the energy used by other products, potentially helping you reduce your carbon footprint and save money.