Incredible 4K UHD resolution with 1,500 lumens and four HDR10 picture modes Android OS with 4K UHD HDR media player, smart TV apps and Optoma Marketplace app store Works with Amazon Alexa and Google Assistant RGBB LED light source with up to 30,000 hour life Stereo audio with Dolby Digital decoding and Bluetooth audio input and output Protective sliding lens cover and power switch Auto focus and auto keystone for easy place and play Compact voice assistant-compatible projection Instantly project incredible 4K UHD images with the compact, 1,500 lumen Optoma UHL55 smart projector. Its protective sliding lens cover and power switch, auto focus, auto keystone, HDR10 support and 250,000:1 contrast ratio ensure easy place and play with gorgeous colors and deep black levels. Amazon Alexa and Google Assistant compatibility enable intuitive voice control for easy smart home integration. Use voice commands to power the projector on and off, change volume, change input source and control the USB media player. An Android OS with smart TV apps and Optoma Marketplace deliver USB media playback compatibility, Internet streaming services and downloadable. Stereo audio with two 8-watt speakers provides crisp audio for movies and music.