Description Key Features: Full HD 1080P 3500 ANSI Lumen 20000:1 Contrast Ratio 2 x HDMI inputs Lamp life up to 15,000 hrs* No More Hassles, Just Present MH550 features convenient setup functions, including retractable adjustment foot to enhance flexibility. And vertical keystone for you align the image perfectly, providing you to hold a meeting immediately. *Lamp life up to 15,000 hrs MH550 offers a lamp life of 15,000 hours. Based on using average 2 hours every day in Smart Eco mode. The lamp is able to last up to 20 years. 2x HDMI inputs To offer more flexible connectivity between devices 3500 Lumens, 20000: 1 Contrast High brightness & contrast images even in well-lit meeting rooms All Glass Optimized Lens To present crystal-clear images Lamp Life up to 15,000 hrs & Easy Lamp Changes SmartEco Mode saves lamp power up to 70%. Top Lamp Door allows for fast lamp changes Multi-purpose Projector for Any Situation Detailed Infographics Exclusive Infographic Mode showcases the text and graphics in detail Fast Image Alignment Vertical keystone for fast, easy image alignment Retractable Adjustment Foot Enhance flexibility in a wide variety of meeting rooms Multi-purpose Projector for Any Situation Meeting Room Table Top Placement, Ceiling Mounted, Mobile Business MH550 MH535 MW550 MW535 Native resolution Full HD Full HD HD Ready HD Ready Brightness (ANSI lumens) 3,500lm 3,500lm 3,600lm 3,600lm Contrast Ratio (FOFO) 20000:1 15000:1 20000:1 15000:1 Long lamp life* 20 years (15,000 hrs) 20 years (15,000 hrs) 20 years (15,000 hrs) 20 years (15,000 hrs) Max screen size 300" 300" 300" 300" HDMI input x2 x2 x2 x2 Speaker 2W 2W 2W 2W Vertical keystone correction ？ ？ ？ ？