The Superior Electric SLF UPS Series of uninterrupted power supply (UPS) advances the price/performance standard for Line Interactive technology. A SLF Series unit is an ideal power quality solution for Mission-critical applications. Units safeguard fileservers, workstations, networking hubs, routers, switches, POS hardware, back office systems, ATMs and telecommunications equipment from blackouts,brownouts,voltage fluctuations and transient voltage surges. True Sine Wave Output Unlike many other Line Interactive UPS on the market today,the SLF Series UPS produces a true sine wave output voltage waveform, just like the incoming utility power. The robust Pulse Width Modulated (PWM) Inverter assures your delicate electronic equipment will always receive the pure sine wave power it was designed for.