Build-in HiFi speakerWith a built-in updated HI-FI Stereo speaker, projector can bring you amazing sound quality and make you an immersive and impressive experience. | Built-in dust spongeProjector has a built-in dust-proof sponge in the air inlet and is designed to be pulled out for easy cleaning. Filter the dust from the air into the inside of the machine. | High-efficiency cooling technologyThe mini projector has the most up-to-date high-efficiency cooling technology, which produces 50% less fan noise and is far quieter than other projectors. |