Graceful shutdown using serial or USB cables via PowerChute Serial Shutdown Add up to 10 external battery packs (SRT96RMBP) 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 3kVA/2.7kW 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.,Graceful shutdown using serial or USB cables via PowerChute Serial Shutdown Add up to 10 external