Voice Assistant-Compatible 4K UHD Projector


  • Works with Amazon Alexa and Google Assistant
  • 4K UHD, bright 2,400 lumens and RGBRGB color wheel
  • HDR10 support for brighter whites, deeper black levels and vivid colors
  • 4K video playback with the integrated USB media player
  • Dynamic Black delivers 500,000:1 contrast ratio for exceptional black levels
  • HDMI 2.0 with HDCP 2.2 connectivity ensures compatibility with 4K UHD video sources
  • Vertical lens shift and 1.3x zoom for easy installation.


A smart projector for a smart home

Take control of your home theater with voice commands. With the Alexa smart home and custom skills or Google Actions, control your 4K UHD 2,400 lumen Optoma UHD51A projector with intuitive voice control and easy integration using Amazon Echo and Google Home devices.


Use voice commands to power the projector on and off, change volume, change input source and control the USB media player. Additionally, the UHD51A utilizes the latest Texas Instruments 4K UHD DLP chipset capable of displaying 8.3-million simultaneous distinct pixels at screen sizes 140 inches and higher.


A pair of HDMI 2.0 inputs with HDCP 2.2 support, HDR compatibility and wide color gamut ensure 4K device compatibility, rich lifelike color and contrast for immersive experiences. A 1.3x optical zoom and 15% vertical lens shift provide installation flexibility.

Optoma UHD51A 4K UHD Smart Projector

  • Aspect Ratio: 16:9 (native), 4:3 and LBX compatible

    Audio : 2 x 5 Watt Speakers (stereo)

    Brightness : 2,400 ANSI lumens

    Color Wheel : RGBRGB 6 segment color wheel

    Connections : 2xHDMI 2.0 (w/ HDCP 2.2, MHL 2.1), VGA-in, audio-in (3.5mm), audio-out, S/PDIF out (optical), x4 USB 2.0, RJ-45, RS-232C, 12V trigger 

    Contrast Ratio: Up to 500,000:1 with Dynamic Black 

    Display Technology: Single 0.47" 4K UHD DMD DLP® by Texas Instruments™ 

    Image Size:  34.1” – 302.4 (34.1” to 140” optimal image size)

    Light Source Life: 4,000/10,000/15,000 (Bright / ECO / Dynamic)

    Lens Shift: Vertical: +10%

    Maximum Resolution: 4K (4096 x 2160) @ 30Hz 

    Native Resolution: 4K UHD (3840 x 2160) @ 60Hz with XPR Technology

    Noise Level: 28/25dB (Bright / ECO)  

    Offset: 100% (see Lens Shift) 

    Power Supply: AC input 100–240V, 50–60Hz, auto-switching 

    Projection Distance: 2.9’ – 34.89' 

    Projection Lens: F=2.5 – 3.26, F=20.91 – 32.62 mm manual focus 

    Projection Method: Front, rear, ceiling mount, table top 

    Remote Control: Full Function Home Remote Control 

    Throw Ratio: 1.21 – 1.59 (distance/width) ±5% variance 

    Uniformity : 80% 

    Zoom Type: 1.3x Manual, 0.8 – 2.0 Digital 

    Dimensions: 15.4"W x 11.1"H x 5.1"D  

    Weight: 11.75 lbs.