Super large screen, super long bulb life, 170 "super large projection screen, bring immersive viewing experience. The portable projector provides a projection size of 30~170 inches and a projection distance of 3.2 feet to 16.4 feet. Because the powerful cooling system effectively cools the heat of the bulb, it has been used for more than 15 years, extending the service life of the bulb to 55000 hours. More durable than previous models.Low-noise dual stereo speakers. Thanks to advanced noise reduction technology, the fan noise of the upgraded mobile phone projector has been reduced by 80%. The built-in dual stereo speakers provide you with loud and clear sound quality. If necessary, connecting to external speakers will obtain higher sound quality.