Note that APC has different lines (at various price points): * Back-UPS: stand-by, Stepped approximation to a sinewave * Back-UPS Pro: line interactive, Stepp

Note that APC has different lines (at various price points): * Back-UPS: stand-by, Stepped approximation to a sinewave * Back-UPS Pro: line interactive, Stepped approximation to a sinewave * Smart-UPS: line interactive, Sine wave * Smart-UPS Online: double-conversion online, Sine wave