Graceful shutdown using serial or USB cables via PowerChute Serial Shutdown Add up to 10 external battery packs (SRT72RMBP) for extended runtime Ideal for servers, storage, voice/data networks, medical labs, and light industrial applications Rack/Tower convertible (rail kit included) Delivers clean power with zero transfer time for critical or sensitive devices 2200VA/1800W double-conversion on-line pure sine wave 2U rackmount UPS This product is heavy and/or oversized and may need more than one person to handle. Energy efficient - designed to use less energy than alternative products, potentially helping you save money and reduce your carbon footprint. Helps save energy - designed to limit the energy used by other products, potentially helping you reduce your carbon footprint and save money.