Remote control batteries: 2 AAA batteries Lens focus: auto focus Keystone correction: four-point keystone correction up, down, left and right 45degree Optical parameters: Display technology 0.23 DMD | Light source technology LED Standard resolution FULL HD 1080P Projection parameters: Zoom multiple fixed focus Throw ratio (TR): 1.2 Projection screen size: 40"-200" Recommended screen size: 60"-120" System parameters: CPU: Amlogic T972-B RAM: 2GB DDR3 Built-in storage: 16GB eMMC high-speed flash memory System software: Operating system: MIUI TV Compatible Xiaomi TV player components APP pre-installed third-party APP