The Rainbow series of vacuum cleaners began in the 1920s with the company ‘Rexair’. These products have been distributed in Singapore since 1986.This is a D4 model of the Rainbow vacuum series. Touted as the latest technology, it was smaller than previous models and used fewer parts in its motor without compromising on performance. Improvements to its system and materials increased its longevity by preventing rust and over-heating. The Rainbow series has since improved by using a HEPA filtration system.