Features:Hi-fi audio: Shock sound quality is extraordinary. It is both a projector and an intelligent sound box, restoring the full-frequency sound effect of audio and video, and experiencing the immersive viewing experience.Airtight optical machine: Airtight optical machine rejects dust. Lenovo H4S projector fully enclosed optical machine to prevent the influence of dust and dust, 30000 hours can not only stay in the theory, and effectively prolong the service life.LED highlight lamp beads: 500ANSI lumens equal to clear during the day. 500ANSI lumens can satisfy daytime viewing, and 200-inch projection at night is not propaganda, but fact.1920 * 1080p physical resolution: Standard high-end decoding chip of Mediatek, easy 4K decoding, 27 image quality improvement technologies, create every detail.Low noise design: ultra quiet design using ultra-quiet cooling technology. The cooling noise of the whole machine is less than 30db, and the small sound is also very clear.