It's a little more than that though, as the Bosch will monitor the amount of air that is passing through the vacuum. If the level of air flow is too low the vacuum will show that. This is actually more useful than it may sound, as you could have a small bit of dust or hair preventing airflow, and thus suction, but you'd have no idea and continue vacuuming your entire home. Bosch have worked hard to keep the Athlet a quiet vacuum. First off let's look at the performance of the Athlet. The first thing you notice when you turn on the Athlet is the plethora of lights on the front of the main container. These act as battery and dust bin indicators. The Athlet is extremely powerful for a cordless. It has 3 power settings, the first doesn't use the powered brush bar and is intended for hard floors. All of the power settings are more powerful than we expected. Bosch make a big deal about the battery life.