The APC SMX1500RM2U Smart-UPS X is used by professionals who need their critical servers and communication systems to ride through power outages. More efficient than on-line UPS's and easier to deploy than generators, the APC SMX1500RM2U Smart-UPS X has the ability to accept external batteries at any time to increase availability and because it is a Smart-UPS, you know it is reliable. The APC SMX1500RM2U provides clean and reliable network-grade power over a wide range of utility conditions. Conditions include surges, spikes, brownouts, blackouts and other transient conditions that can cause costly downtime, data loss or hardware damage.