What types of filters are equipped with this portable cordless vacuum cleaner?

This portable cordless vacuum cleaner is equipped with multiple types of filters to ensure efficient filtering and cleaning performance. Specifically, it is equipped with the following types of filters:
Cyclone filter: The cyclone filter, as the line of defense in the vacuum cleaner, uses the principle of centrifugal force to achieve efficient separation of air and dust. When the vacuum cleaner is started and inhales a mixture of air and dust, these mixtures quickly pass through one or more carefully designed cyclone channels. In the cyclone channel, air and dust particles rotate at high speed. Due to the centrifugal force, the dust particles are thrown to the inner wall of the container and slide down the inner wall into the dust box. The clean air passes through the center of the cyclone channel, continues to flow forward, and is finally discharged through the central duct of the vacuum cleaner. This design not only improves the filtering efficiency, but also reduces the wind resistance inside the vacuum cleaner, thereby ensuring that the vacuum cleaner can work continuously and efficiently. 
Sponge filter: The sponge filter, as the second line of defense in the vacuum cleaner, is usually located downstream of the cyclone filter. It is made of high-density sponge material, which has superb adsorption and filtration properties. The sponge filter can capture smaller particles that are missed by the cyclone filter, such as fine dust, pollen, dust mites, etc. At the same time, due to its high-density structure, the sponge filter can also effectively filter allergens in the air, providing users with a healthier and more comfortable indoor environment. In addition, the sponge filter also has a certain degree of hygroscopicity. In a humid environment, the sponge filter can absorb moisture in the air and prevent condensation inside the vacuum cleaner, thereby protecting the electronic components and motor of the vacuum cleaner from damage.
HEPA filter: The HEPA filter, as the last line of defense in the vacuum cleaner, has reached an peak level of filtration. The HEPA filter can capture tiny particles of 0.3 microns and above, including bacteria, viruses, pollen, dust mites, etc. These tiny particles not only pose a threat to human health, but also have a serious impact on indoor air quality. HEPA filters are usually made of one or more layers of fine fiber materials with very small gaps between them, only a few microns or even smaller. When air passes through the HEPA filter, these tiny particles are captured and attached to the fiber material, while clean air can pass through smoothly. This design ensures that the HEPA filter can capture almost all harmful particles, providing users with a healthier and cleaner indoor environment.
The combination of these filters allows this portable cordless vacuum cleaner to effectively filter and remove harmful substances in the air while maintaining efficient vacuuming performance, bringing users a healthier and more comfortable cleaning experience.