Microprocessor Based & True Sine Wave Output. Suitable for Inducive Loads, especially the Lighting Equipment. Remaining Back-up Time is Shown at Real-Time Basis for LCD Display Version. Extra Wide Input Range (up to +/- 35%) or More Precise Output Regulation is Optional. Load / Battery Level Indication is Available in LED Display Version, and Much More Information (more than 20 items) is Displayed by LCD in LCD Display Version. All-in-One button for Self-test, Alarm-reset & DC start. Built-in CCCV Battery Charger and Battery Polarity Inverted / Over Drain Protection. Compatible with All Major O.S., Including Windows, Linux, SCO Unix, Dos.