Due to problems related to both flight restrictions and the liquids within compressed air, Visible Dust has developed the revolutionary Sensor Brush SD (Spinning Device) which eliminates the need for canned air. The Sensor Brush SD Provides the necessary static charge for the sensor brushes to properly remove dust and debris from the image sensor of your digital camera without the need for canned (compressed) air. The high speed spinning action creates the static charge and cleans dust out of the brush.