"The new Electrolux Callisto has been developed to address a number of the key problems associated with today's bagless vacuum cleaners. Having listened to what consumers told us in our research - the result is a user-friendly cyclonic cylinder packed with features for easier and hassle-free vacuuming.Many of today's bagless cleaners require frequent filter cleaning, since the filters are often located inside the dust bin they can become clogged with dirt very quickly. Plus, people are often unsure of how frequently the filters need changing, since there is no indicator to tell. The Callisto has specially developed with a 'No Touch' easy clean filter system. There are two HEPA filters which are interchangeable - simply switch the filters and rotate the dirty filter 360 degrees, the indicator light will come on once the filter is totally clean. You'll have clean filters every time you vacuum, without the need to wash them and wait for them to dry"