The compact cordless shop vacuums, on the average, are a quiet shop vacuum compared to the larger corded models. This is due to the design and the amperage of the motor. These cordless shop vacuums are very versatile due to their compact size and light weight. Many of them are equipped with interchangeable accessories that add to their versatility. Furthermore, because these compact cordless shop vacuums are lighter than the regular full size shop vacuum, they can be carried from place to place with ease so that a variety of tasks can be performed without the need to drag around an electrical cord.
For more info, see A Car Vacuum Buying Guide