DBPOWER has upgraded the brightness based on the original projector to offer our customers a more cost-effective product. It is great for watching movies and sports games, holding parties, or parent-children interaction. Not recommended for ppts, word, excel, or business presentations. To relax your eyesight, please take...........a break for every 23 hours using. If there's no sound, turn off Dolby digital in Netflix, apple tv, blue-ray players and firestick, etc.., DBPOWER also enhanced the projection color contrast to 2000:1 to present the vivid video images to our customers. 50,000-Hour Lamp Life Adopted the latest smart LED lamp care technology. The life of the lamp is 50000 hours, which means it can last for at least 20 years. By placing the projector at an optimum distance of about 1.8 to 2.0m, it will display a super-clear and bright 130 images. Built-In stereo speakers give you a surround sound style experience.