2. Pure sine wave inverter. A sine wave is naturally occurring in electronic and communication applications. A pure sine wave can be obtained from pure sine generators or utility companies. These inverters are a bit costly compared to the modified ones. Protection: LED Indicator& Audible Alarm. 12V or 24V or 48VDC input Input voltage range: -15% ~ +25% Output voltage regulation: 10% ... Some equipment only operate properly with pure sine wave inverter, such as laser printers, variable speed. KISAE True Sine Wave power inverters convert 12V DC battery power into 120V household AC power identical to or better than that supplied by your local utility company. Since all electronic equipment and circuitry are designed to operate with a Pure or True Sine waveform, many loads will perform better, run cooler and generate low harmonic.