Smartonline rackmount/tower ups systems provide mission-critical equipment with the highest level of power protection. Double-conversion technology continually converts incoming ac power into filtered dc power, and then resynthesizes it back into ac power with a pure sine wave. Constant on-line operation completely isolates sensitive equipment from every power problem on the ac line. Smartonline models accept the widest range of incoming voltage and frequency variations, delivering the most consistently pure, highly-regulated ac power: +/-2% v and +/-0.2 Hz. Smartonline rackmount/tower ups systems provide reliable battery power with zero transfer time to keep networks up and running safely through short blackouts and allow enough time to safely shut down during longer ones. In addition, they stop damaging lightning and surges and filter disruptive line noise. Features and specifications: power device type: ups. Ups technology: on-line. Voltage provided: ac 120 v +/- 2% ( 50/60 hz ). Voltage required: ac 120 v. Circuit protection: circuit breaker. Power supply form factor: rack-mountable. Power: surge suppression: standard. Battery: battery type: ups battery; battery form factor: plug-in module; battery / run time: 5 min at full load. Connection: interfaces and connections: interfaces : 1 x usb - 4 pin usb type b, 1 x management - rs-232 - 9 pin d-sub (db-9) ; expansion slots total (free) : 1 x expansion slot. Input connector(s): 1 x power nema 5-15. Output connector(s): 6 x power nema 5-15. Dimension(wxdxh): 17.5 X 19 x 3.5.