From the about section (<a href="https://www.quietmark.com/what-is-quiet-mark" rel="nofollow">https://www.quietmark.com/what-is-quiet-mark</a>): "Quiet Mark is the independent global certification programme associated with the UK Noise Abatement Society charitable foundation (est.1959). Through scientific testing and assessment Quiet Mark identifies the quietest products in multiple categories spanning many sectors, including: home appliances and technology, building sector materials and commercial sector products. "